commit 46c0be23e82f73de788fe1e8432b6037b9f2d08d
Author: sneedium <sneed@sneedmc.org>
Date:   Mon Feb 21 12:58:43 2022 -0500

    initial

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..53f7a73
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,35 @@
+prefix=/usr/local
+confdir=/etc
+systemd_dir=${DESTDIR}${confdir}/systemd/system
+nginx_dir=${DESTDIR}${confdir}/nginx
+bindir=${DESTDIR}${prefix}/bin
+
+CC			:= gcc
+CFLAGS		:= -O2 ${CFLAGS}
+
+BIN			:= sneedmc
+
+SOURCE	:= main.c mongoose.c
+OBJ		:= mongoose.o main.o
+DEPS	:= mongoose.h
+LIBS	:= -lcrypt
+
+all: $(BIN)
+
+clean:
+	rm -f $(OBJ)
+
+$(BIN): $(OBJ)
+	$(CC) $(CFLAGS) -o $@ $^ $(LIBS)
+
+install-nginx:
+	@install -Dm644 doc/sneedmc.nginx ${nginx_dir}/sites-available/sneedmc
+
+install-systemd:
+	@install -Dm644 doc/sneedmc.service ${systemd_dir}/sneedmc.service
+	@install -Dm644 doc/sneedmc.conf ${DESTDIR}/${confdir}/sneedmc.conf
+
+install-bin:
+	@install -Dm755 ${BIN} ${bindir}/${BIN}
+
+install: install-bin install-nginx install-systemd
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..46568d8
--- /dev/null
+++ b/index.html
@@ -0,0 +1 @@
+a:
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..e99d8ba
--- /dev/null
+++ b/main.c
@@ -0,0 +1,84 @@
+#include "mongoose.h"
+
+char *port = "6333";
+
+void trim(char *str) {
+    char *_str = str;
+    int len = strlen(_str);
+
+    while(*_str && *_str == '/') ++_str, --len;
+
+    memmove(str, _str, len + 1);
+}
+
+static void ev_handler(struct mg_connection *nc, int ev, void *p, void *f) {
+    if (ev == MG_EV_HTTP_MSG) {
+        struct mg_http_message *hm = (struct mg_http_message *) p;
+        char *uri = malloc(hm->uri.len + 1);
+
+        snprintf(uri, hm->uri.len + 1, "%s", hm->uri.ptr);
+        trim(uri);
+
+        char *query = NULL;
+        struct mg_str hquery = hm->query;
+        if (hquery.len > 0) {
+            char *base_query = malloc(hquery.len + 1);
+            snprintf(base_query, hquery.len + 1, "%s", hquery.ptr);
+
+            query = malloc(256);
+            mg_url_decode(base_query, hquery.len + 1, query, 256, 0);
+            free(base_query);
+        } else {
+            query = malloc(1);
+            sprintf(query, "");
+        }
+
+        struct mg_str *pmhost = mg_http_get_header(hm, "Host");
+        struct mg_str mhost;
+        if (pmhost == NULL) {
+            fprintf(stderr, "request sent with no Host header");
+            mhost = mg_str("<UNKNOWN DOMAIN>");
+        } else {
+            mhost = *pmhost;
+        }
+
+        char *host = malloc(mhost.len + 1);
+        snprintf(host, mhost.len + 1, "%s", mhost.ptr);
+
+        char *body = strdup(hm->body.ptr);
+
+        if (strncmp(hm->method.ptr, "POST", hm->method.len) == 0) {
+        } else if (strncmp(hm->method.ptr, "GET", hm->method.len) == 0){
+            struct mg_http_serve_opts opts = {.root_dir = "."};   // Serve local dir
+            mg_http_serve_dir(nc, p, &opts);
+        } else {
+            mg_http_reply(nc, 405, "Allow: GET, POST\r\n", "");
+        }
+
+        free(uri);
+        free(host);
+        free(body);
+        free(query);
+    }
+}
+
+
+int main(int argc, char *argv[]) {
+    struct mg_mgr mgr;
+    struct mg_connection *nc;
+
+    mg_mgr_init(&mgr);
+    printf("Starting web server on port %s\n", port);
+    char *str_port = malloc(20);
+    sprintf(str_port, "http://0.0.0.0:%s", port);
+    nc = mg_http_listen(&mgr, str_port, ev_handler, &mgr);
+    if (nc == NULL) {
+        printf("Failed to create listener\n");
+        return 1;
+    }
+
+    for (;;) { mg_mgr_poll(&mgr, 1000); }
+    mg_mgr_free(&mgr);
+    return 0;
+}
+
diff --git a/main.o b/main.o
new file mode 100644
index 0000000..b6fdf08
Binary files /dev/null and b/main.o differ
diff --git a/mongoose.c b/mongoose.c
new file mode 100644
index 0000000..3b13219
--- /dev/null
+++ b/mongoose.c
@@ -0,0 +1,5105 @@
+// Copyright (c) 2004-2013 Sergey Lyubka
+// Copyright (c) 2013-2021 Cesanta Software Limited
+// All rights reserved
+//
+// This software is dual-licensed: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation. For the terms of this
+// license, see http://www.gnu.org/licenses/
+//
+// You are free to use this software under the terms of the GNU General
+// Public License, but WITHOUT ANY WARRANTY; without even the implied
+// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// Alternatively, you can license this software under a commercial
+// license, as set out in https://www.mongoose.ws/licensing/
+
+#include "mongoose.h"
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/base64.c"
+#endif
+
+#include <string.h>
+
+static int mg_b64idx(int c) {
+  if (c < 26) {
+    return c + 'A';
+  } else if (c < 52) {
+    return c - 26 + 'a';
+  } else if (c < 62) {
+    return c - 52 + '0';
+  } else {
+    return c == 62 ? '+' : '/';
+  }
+}
+
+static int mg_b64rev(int c) {
+  if (c >= 'A' && c <= 'Z') {
+    return c - 'A';
+  } else if (c >= 'a' && c <= 'z') {
+    return c + 26 - 'a';
+  } else if (c >= '0' && c <= '9') {
+    return c + 52 - '0';
+  } else if (c == '+') {
+    return 62;
+  } else if (c == '/') {
+    return 63;
+  } else if (c == '=') {
+    return 64;
+  } else {
+    return -1;
+  }
+}
+
+int mg_base64_update(unsigned char ch, char *to, int n) {
+  int rem = (n & 3) % 3;
+  if (rem == 0) {
+    to[n] = (char) mg_b64idx(ch >> 2);
+    to[++n] = (char) ((ch & 3) << 4);
+  } else if (rem == 1) {
+    to[n] = (char) mg_b64idx(to[n] | (ch >> 4));
+    to[++n] = (char) ((ch & 15) << 2);
+  } else {
+    to[n] = (char) mg_b64idx(to[n] | (ch >> 6));
+    to[++n] = (char) mg_b64idx(ch & 63);
+    n++;
+  }
+  return n;
+}
+
+int mg_base64_final(char *to, int n) {
+  int saved = n;
+  // printf("---[%.*s]\n", n, to);
+  if (n & 3) n = mg_base64_update(0, to, n);
+  if ((saved & 3) == 2) n--;
+  // printf("    %d[%.*s]\n", n, n, to);
+  while (n & 3) to[n++] = '=';
+  to[n] = '\0';
+  return n;
+}
+
+int mg_base64_encode(const unsigned char *p, int n, char *to) {
+  int i, len = 0;
+  for (i = 0; i < n; i++) len = mg_base64_update(p[i], to, len);
+  len = mg_base64_final(to, len);
+  return len;
+}
+
+int mg_base64_decode(const char *src, int n, char *dst) {
+  const char *end = src + n;
+  int len = 0;
+  while (src + 3 < end) {
+    int a = mg_b64rev(src[0]), b = mg_b64rev(src[1]), c = mg_b64rev(src[2]),
+        d = mg_b64rev(src[3]);
+    if (a == 64 || a < 0 || b == 64 || b < 0 || c < 0 || d < 0) return 0;
+    dst[len++] = (char) ((a << 2) | (b >> 4));
+    if (src[2] != '=') {
+      dst[len++] = (char) ((b << 4) | (c >> 2));
+      if (src[3] != '=') dst[len++] = (char) ((c << 6) | d);
+    }
+    src += 4;
+  }
+  dst[len] = '\0';
+  return len;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/dns.c"
+#endif
+
+
+
+
+
+
+
+struct dns_data {
+  struct dns_data *next;
+  struct mg_connection *c;
+  int64_t expire;
+  uint16_t txnid;
+};
+
+static struct dns_data *s_reqs;  // Active DNS requests
+
+static void mg_sendnsreq(struct mg_connection *, struct mg_str *, int,
+                         struct mg_dns *, bool);
+
+static void mg_dns_free(struct dns_data *d) {
+  LIST_DELETE(struct dns_data, &s_reqs, d);
+  free(d);
+}
+
+void mg_resolve_cancel(struct mg_connection *c) {
+  struct dns_data *tmp, *d;
+  for (d = s_reqs; d != NULL; d = tmp) {
+    tmp = d->next;
+    if (d->c == c) mg_dns_free(d);
+  }
+}
+
+static size_t mg_dns_parse_name_depth(const uint8_t *s, size_t len, size_t ofs,
+                                      char *to, size_t tolen, int depth) {
+  size_t i = 0, j = 0;
+  if (tolen > 0) to[0] = '\0';
+  if (depth > 5) return 0;
+  while (ofs + i + 1 < len) {
+    size_t n = s[ofs + i];
+    if (n == 0) {
+      i++;
+      break;
+    }
+    if (n & 0xc0) {
+      size_t ptr = (((n & 0x3f) << 8) | s[ofs + i + 1]);  // 12 is hdr len
+      if (ptr + 1 < len && (s[ptr] & 0xc0) == 0 &&
+          mg_dns_parse_name_depth(s, len, ptr, to, tolen, depth + 1) == 0)
+        return 0;
+      i += 2;
+      break;
+    }
+    if (ofs + i + n + 1 >= len) return 0;
+    if (j > 0) {
+      if (j < tolen) to[j] = '.';
+      j++;
+    }
+    if (j + n < tolen) memcpy(&to[j], &s[ofs + i + 1], n);
+    j += n;
+    i += n + 1;
+    if (j < tolen) to[j] = '\0';  // Zero-terminate this chunk
+  }
+  if (tolen > 0) to[tolen - 1] = '\0';  // Make sure make sure it is nul-term
+  return i;
+}
+
+static size_t mg_dns_parse_name(const uint8_t *s, size_t n, size_t ofs,
+                                char *dst, size_t dstlen) {
+  return mg_dns_parse_name_depth(s, n, ofs, dst, dstlen, 0);
+}
+
+size_t mg_dns_parse_rr(const uint8_t *buf, size_t len, size_t ofs,
+                       bool is_question, struct mg_dns_rr *rr) {
+  const uint8_t *s = buf + ofs, *e = &buf[len];
+
+  memset(rr, 0, sizeof(*rr));
+  if (len < sizeof(struct mg_dns_header)) return 0;  // Too small
+  if (len > 512) return 0;  //  Too large, we don't expect that
+  if (s >= e) return 0;     //  Overflow
+
+  if ((rr->nlen = (uint16_t) mg_dns_parse_name(buf, len, ofs, NULL, 0)) == 0)
+    return 0;
+  s += rr->nlen + 4;
+  if (s > e) return 0;
+  rr->atype = (uint16_t) (((uint16_t) s[-4] << 8) | s[-3]);
+  rr->aclass = (uint16_t) (((uint16_t) s[-2] << 8) | s[-1]);
+  if (is_question) return (size_t) (rr->nlen + 4);
+
+  s += 6;
+  if (s > e) return 0;
+  rr->alen = (uint16_t) (((uint16_t) s[-2] << 8) | s[-1]);
+  if (s + rr->alen > e) return 0;
+  return (size_t) (rr->nlen + rr->alen + 10);
+}
+
+bool mg_dns_parse(const uint8_t *buf, size_t len, struct mg_dns_message *dm) {
+  const struct mg_dns_header *h = (struct mg_dns_header *) buf;
+  struct mg_dns_rr rr;
+  size_t i, n, ofs = sizeof(*h);
+  memset(dm, 0, sizeof(*dm));
+
+  if (len < sizeof(*h)) return 0;                // Too small, headers dont fit
+  if (mg_ntohs(h->num_questions) > 1) return 0;  // Sanity
+  if (mg_ntohs(h->num_answers) > 10) return 0;   // Sanity
+  dm->txnid = mg_ntohs(h->txnid);
+
+  for (i = 0; i < mg_ntohs(h->num_questions); i++) {
+    if ((n = mg_dns_parse_rr(buf, len, ofs, true, &rr)) == 0) return false;
+    // MG_INFO(("Q %zu %zu", ofs, n));
+    ofs += n;
+  }
+  for (i = 0; i < mg_ntohs(h->num_answers); i++) {
+    // MG_INFO(("A -- %zu %zu %s", ofs, n, dm->name));
+    if ((n = mg_dns_parse_rr(buf, len, ofs, false, &rr)) == 0) return false;
+    mg_dns_parse_name(buf, len, ofs, dm->name, sizeof(dm->name));
+    ofs += n;
+
+    if (rr.alen == 4 && rr.atype == 1 && rr.aclass == 1) {
+      dm->addr.is_ip6 = false;
+      memcpy(&dm->addr.ip, &buf[ofs - 4], 4);
+      dm->resolved = true;
+      break;  // Return success
+    } else if (rr.alen == 16 && rr.atype == 28 && rr.aclass == 1) {
+      dm->addr.is_ip6 = true;
+      memcpy(&dm->addr.ip6, &buf[ofs - 16], 16);
+      dm->resolved = true;
+      break;  // Return success
+    }
+  }
+  return true;
+}
+
+static void dns_cb(struct mg_connection *c, int ev, void *ev_data,
+                   void *fn_data) {
+  struct dns_data *d, *tmp;
+  if (ev == MG_EV_POLL) {
+    int64_t now = *(int64_t *) ev_data;
+    for (d = s_reqs; d != NULL; d = tmp) {
+      tmp = d->next;
+      // MG_DEBUG ("%lu %lu dns poll", d->expire, now));
+      if (now > d->expire) mg_error(d->c, "DNS timeout");
+    }
+  } else if (ev == MG_EV_READ) {
+    struct mg_dns_message dm;
+    int resolved = 0;
+    if (mg_dns_parse(c->recv.buf, c->recv.len, &dm) == false) {
+      char *s = mg_hexdump(c->recv.buf, c->recv.len);
+      MG_ERROR(("Unexpected DNS response:\n%s\n", s));
+      free(s);
+    } else {
+      MG_VERBOSE(("%s %d", dm.name, dm.resolved));
+      for (d = s_reqs; d != NULL; d = tmp) {
+        tmp = d->next;
+        // MG_INFO(("d %p %hu %hu", d, d->txnid, dm.txnid));
+        if (dm.txnid != d->txnid) continue;
+        if (d->c->is_resolving) {
+          d->c->is_resolving = 0;
+          if (dm.resolved) {
+            char buf[100];
+            dm.addr.port = d->c->peer.port;  // Save port
+            d->c->peer = dm.addr;            // Copy resolved address
+            MG_DEBUG(("%lu %s resolved to %s", d->c->id, dm.name,
+                      mg_ntoa(&d->c->peer, buf, sizeof(buf))));
+            mg_connect_resolved(d->c);
+#if MG_ENABLE_IPV6
+          } else if (dm.addr.is_ip6 == false && dm.name[0] != '\0') {
+            struct mg_str x = mg_str(dm.name);
+            mg_sendnsreq(d->c, &x, c->mgr->dnstimeout, &c->mgr->dns6, true);
+#endif
+          } else {
+            mg_error(d->c, "%s DNS lookup failed", dm.name);
+          }
+        } else {
+          MG_ERROR(("%lu already resolved", d->c->id));
+        }
+        mg_dns_free(d);
+        resolved = 1;
+      }
+    }
+    if (!resolved) MG_ERROR(("stray DNS reply"));
+    c->recv.len = 0;
+  } else if (ev == MG_EV_CLOSE) {
+    for (d = s_reqs; d != NULL; d = tmp) {
+      tmp = d->next;
+      mg_error(d->c, "DNS error");
+      mg_dns_free(d);
+    }
+  }
+  (void) fn_data;
+}
+
+static void mg_dns_send(struct mg_connection *c, const struct mg_str *name,
+                        uint16_t txnid, bool ipv6) {
+  struct {
+    struct mg_dns_header header;
+    uint8_t data[256];
+  } pkt;
+  size_t i, n;
+  memset(&pkt, 0, sizeof(pkt));
+  pkt.header.txnid = mg_htons(txnid);
+  pkt.header.flags = mg_htons(0x100);
+  pkt.header.num_questions = mg_htons(1);
+  for (i = n = 0; i < sizeof(pkt.data) - 5; i++) {
+    if (name->ptr[i] == '.' || i >= name->len) {
+      pkt.data[n] = (uint8_t) (i - n);
+      memcpy(&pkt.data[n + 1], name->ptr + n, i - n);
+      n = i + 1;
+    }
+    if (i >= name->len) break;
+  }
+  memcpy(&pkt.data[n], "\x00\x00\x01\x00\x01", 5);  // A query
+  n += 5;
+  if (ipv6) pkt.data[n - 3] = 0x1c;  // AAAA query
+  // memcpy(&pkt.data[n], "\xc0\x0c\x00\x1c\x00\x01", 6);  // AAAA query
+  // n += 6;
+  mg_send(c, &pkt, sizeof(pkt.header) + n);
+#if 0
+  // Immediately after A query, send AAAA query. Whatever reply comes first,
+  // we'll use it. Note: we cannot send two queries in a single packet.
+  // https://stackoverflow.com/questions/4082081/requesting-a-and-aaaa-records-in-single-dns-query
+  pkt.data[n - 3] = 0x1c;  // AAAA query
+  mg_send(c, &pkt, sizeof(pkt.header) + n);
+#endif
+}
+
+static void mg_sendnsreq(struct mg_connection *c, struct mg_str *name, int ms,
+                         struct mg_dns *dnsc, bool ipv6) {
+  struct dns_data *d = NULL;
+  if (dnsc->url == NULL) {
+    mg_error(c, "DNS server URL is NULL. Call mg_mgr_init()");
+  } else if (dnsc->c == NULL) {
+    dnsc->c = mg_connect(c->mgr, dnsc->url, NULL, NULL);
+    if (dnsc->c != NULL) {
+      dnsc->c->pfn = dns_cb;
+      // dnsc->c->is_hexdumping = 1;
+    }
+  }
+  if (dnsc->c == NULL) {
+    mg_error(c, "resolver");
+  } else if ((d = (struct dns_data *) calloc(1, sizeof(*d))) == NULL) {
+    mg_error(c, "resolve OOM");
+  } else {
+    char buf[100];
+    d->txnid = s_reqs ? (uint16_t) (s_reqs->txnid + 1) : 1;
+    d->next = s_reqs;
+    s_reqs = d;
+    d->expire = mg_millis() + (int64_t) ms;
+    d->c = c;
+    c->is_resolving = 1;
+    MG_VERBOSE(("%lu resolving %.*s @ %s, txnid %hu", c->id, (int) name->len,
+                name->ptr, mg_ntoa(&dnsc->c->peer, buf, sizeof(buf)),
+                d->txnid));
+    mg_dns_send(dnsc->c, name, d->txnid, ipv6);
+  }
+}
+
+void mg_resolve(struct mg_connection *c, const char *url) {
+  struct mg_str host = mg_url_host(url);
+  c->peer.port = mg_htons(mg_url_port(url));
+  if (mg_aton(host, &c->peer)) {
+    // host is an IP address, do not fire name resolution
+    mg_connect_resolved(c);
+  } else {
+    // host is not an IP, send DNS resolution request
+    mg_sendnsreq(c, &host, c->mgr->dnstimeout, &c->mgr->dns4, false);
+  }
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/event.c"
+#endif
+
+
+
+
+
+void mg_call(struct mg_connection *c, int ev, void *ev_data) {
+  // Run user-defined handler first, in order to give it an ability
+  // to intercept processing (e.g. clean input buffer) before the
+  // protocol handler kicks in
+  if (c->fn != NULL) c->fn(c, ev, ev_data, c->fn_data);
+  if (c->pfn != NULL) c->pfn(c, ev, ev_data, c->pfn_data);
+}
+
+void mg_error(struct mg_connection *c, const char *fmt, ...) {
+  char mem[256], *buf = mem;
+  va_list ap;
+  va_start(ap, fmt);
+  mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  va_end(ap);
+  MG_ERROR(("%lu %s", c->id, buf));
+  c->is_closing = 1;             // Set is_closing before sending MG_EV_CALL
+  mg_call(c, MG_EV_ERROR, buf);  // Let user handler to override it
+  if (buf != mem) free(buf);
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/fs.c"
+#endif
+
+
+
+struct mg_fd *mg_fs_open(struct mg_fs *fs, const char *path, int flags) {
+  struct mg_fd *fd = (struct mg_fd *) calloc(1, sizeof(*fd));
+  if (fd != NULL) {
+    fd->fd = fs->op(path, flags);
+    fd->fs = fs;
+    if (fd->fd == NULL) {
+      free(fd);
+      fd = NULL;
+    }
+  }
+  return fd;
+}
+
+void mg_fs_close(struct mg_fd *fd) {
+  if (fd != NULL) {
+    fd->fs->cl(fd->fd);
+    free(fd);
+  }
+}
+
+char *mg_file_read(struct mg_fs *fs, const char *path, size_t *sizep) {
+  struct mg_fd *fd;
+  char *data = NULL;
+  size_t size = 0;
+  fs->st(path, &size, NULL);
+  if ((fd = mg_fs_open(fs, path, MG_FS_READ)) != NULL) {
+    data = (char *) calloc(1, size + 1);
+    if (data != NULL) {
+      if (fs->rd(fd->fd, data, size) != size) {
+        free(data);
+        data = NULL;
+      } else {
+        data[size] = '\0';
+        if (sizep != NULL) *sizep = size;
+      }
+    }
+    mg_fs_close(fd);
+  }
+  return data;
+}
+
+bool mg_file_write(struct mg_fs *fs, const char *path, const void *buf,
+                   size_t len) {
+  bool result = false;
+  struct mg_fd *fd;
+  char tmp[MG_PATH_MAX];
+  mg_snprintf(tmp, sizeof(tmp), "%s..%d", path, rand());
+  if ((fd = mg_fs_open(fs, tmp, MG_FS_WRITE)) != NULL) {
+    result = fs->wr(fd->fd, buf, len) == len;
+    mg_fs_close(fd);
+    if (result) {
+      fs->rm(path);
+      fs->mv(tmp, path);
+    } else {
+      fs->rm(tmp);
+    }
+  }
+  return result;
+}
+
+bool mg_file_printf(struct mg_fs *fs, const char *path, const char *fmt, ...) {
+  char tmp[256], *buf = tmp;
+  bool result;
+  size_t len;
+  va_list ap;
+  va_start(ap, fmt);
+  len = mg_vasprintf(&buf, sizeof(tmp), fmt, ap);
+  va_end(ap);
+  result = mg_file_write(fs, path, buf, len > 0 ? (size_t) len : 0);
+  if (buf != tmp) free(buf);
+  return result;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/fs_fat.c"
+#endif
+
+
+#if MG_ENABLE_FATFS
+#include <ff.h>
+
+static int mg_days_from_epoch(int y, int m, int d) {
+  y -= m <= 2;
+  int era = y / 400;
+  int yoe = y - era * 400;
+  int doy = (153 * (m + (m > 2 ? -3 : 9)) + 2) / 5 + d - 1;
+  int doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
+  return era * 146097 + doe - 719468;
+}
+
+static time_t mg_timegm(struct tm const *t) {
+  int year = t->tm_year + 1900;
+  int month = t->tm_mon;  // 0-11
+  if (month > 11) {
+    year += month / 12;
+    month %= 12;
+  } else if (month < 0) {
+    int years_diff = (11 - month) / 12;
+    year -= years_diff;
+    month += 12 * years_diff;
+  }
+  int x = mg_days_from_epoch(year, month + 1, t->tm_mday);
+  return 60 * (60 * (24L * x + t->tm_hour) + t->tm_min) + t->tm_sec;
+}
+
+static time_t ff_time_to_epoch(uint16_t fdate, uint16_t ftime) {
+  struct tm tm;
+  memset(&tm, 0, sizeof(struct tm));
+  tm.tm_sec = (ftime << 1) & 0x3e;
+  tm.tm_min = ((ftime >> 5) & 0x3f);
+  tm.tm_hour = ((ftime >> 11) & 0x1f);
+  tm.tm_mday = (fdate & 0x1f);
+  tm.tm_mon = ((fdate >> 5) & 0x0f) - 1;
+  tm.tm_year = ((fdate >> 9) & 0x7f) + 80;
+  return mg_timegm(&tm);
+}
+
+static int ff_stat(const char *path, size_t *size, time_t *mtime) {
+  FILINFO fi;
+  if (path[0] == '\0' || strcmp(path, MG_FATFS_ROOT) == 0) {
+    if (size) *size = 0;
+    if (mtime) *mtime = 0;
+    return MG_FS_DIR;
+  } else if (f_stat(path, &fi) == 0) {
+    if (size) *size = (size_t) fi.fsize;
+    if (mtime) *mtime = ff_time_to_epoch(fi.fdate, fi.ftime);
+    return MG_FS_READ | MG_FS_WRITE | ((fi.fattrib & AM_DIR) ? MG_FS_DIR : 0);
+  } else {
+    return 0;
+  }
+}
+
+static void ff_list(const char *dir, void (*fn)(const char *, void *),
+                    void *userdata) {
+  DIR d;
+  FILINFO fi;
+  if (f_opendir(&d, dir) == FR_OK) {
+    while (f_readdir(&d, &fi) == FR_OK && fi.fname[0] != '\0') {
+      if (!strcmp(fi.fname, ".") || !strcmp(fi.fname, "..")) continue;
+      fn(fi.fname, userdata);
+    }
+    f_closedir(&d);
+  }
+}
+
+static void *ff_open(const char *path, int flags) {
+  FIL f;
+  unsigned char mode = FA_READ;
+  if (flags & MG_FS_WRITE) mode |= FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_APPEND;
+  if (f_open(&f, path, mode) == 0) {
+    FIL *fp = calloc(1, sizeof(*fp));
+    *fp = f;
+    return fp;
+  } else {
+    return NULL;
+  }
+}
+
+static void ff_close(void *fp) {
+  if (fp != NULL) {
+    f_close((FIL *) fp);
+    free(fp);
+  }
+}
+
+static size_t ff_read(void *fp, void *buf, size_t len) {
+  unsigned n = 0, misalign = ((size_t) buf) & 3;
+  if (misalign) {
+    char aligned[4];
+    f_read((FIL *) fp, aligned, len > misalign ? misalign : len, &n);
+    memcpy(buf, aligned, n);
+  } else {
+    f_read((FIL *) fp, buf, len, &n);
+  }
+  return n;
+}
+
+static size_t ff_write(void *fp, const void *buf, size_t len) {
+  unsigned n, sum = 0, bs = MG_FATFS_BSIZE;
+  while ((size_t) sum < len &&
+         f_write((FIL *) fp, (char *) buf + sum,
+                 sum + bs > len ? len - sum : bs, &n) == FR_OK &&
+         n > 0) {
+    sum += n;
+  }
+  return sum;
+}
+
+static size_t ff_seek(void *fp, size_t offset) {
+  f_lseek((FIL *) fp, offset);
+  return offset;
+}
+
+static bool ff_rename(const char *from, const char *to) {
+  return f_rename(from, to) == FR_OK;
+}
+
+static bool ff_remove(const char *path) {
+  return f_unlink(path) == FR_OK;
+}
+
+static bool ff_mkdir(const char *path) {
+  return f_mkdir(path) == FR_OK;
+}
+
+struct mg_fs mg_fs_fat = {ff_stat,  ff_list, ff_open,   ff_close,  ff_read,
+                          ff_write, ff_seek, ff_rename, ff_remove, ff_mkdir};
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/fs_packed.c"
+#endif
+
+
+
+struct packed_file {
+  const char *data;
+  size_t size;
+  size_t pos;
+};
+
+const char *mg_unpack(const char *path, size_t *size, time_t *mtime);
+const char *mg_unlist(size_t no);
+#if MG_ENABLE_PACKED_FS
+#else
+const char *mg_unpack(const char *path, size_t *size, time_t *mtime) {
+  (void) path, (void) size, (void) mtime;
+  return NULL;
+}
+const char *mg_unlist(size_t no) {
+  (void) no;
+  return NULL;
+}
+#endif
+
+static int is_dir_prefix(const char *prefix, size_t n, const char *path) {
+  return n < strlen(path) && memcmp(prefix, path, n) == 0 && path[n] == '/';
+  //(n == 0 || path[n] == MG_DIRSEP);
+}
+
+static int packed_stat(const char *path, size_t *size, time_t *mtime) {
+  const char *p;
+  size_t i, n = strlen(path);
+  if (mg_unpack(path, size, mtime)) return MG_FS_READ;  // Regular file
+  // Scan all files. If `path` is a dir prefix for any of them, it's a dir
+  for (i = 0; (p = mg_unlist(i)) != NULL; i++) {
+    if (is_dir_prefix(path, n, p)) return MG_FS_DIR;
+  }
+  return 0;
+}
+
+static void packed_list(const char *dir, void (*fn)(const char *, void *),
+                        void *userdata) {
+  char buf[256], tmp[sizeof(buf)];
+  const char *path, *begin, *end;
+  size_t i, n = strlen(dir);
+  tmp[0] = '\0';  // Previously listed entry
+  for (i = 0; (path = mg_unlist(i)) != NULL; i++) {
+    if (!is_dir_prefix(dir, n, path)) continue;
+    begin = &path[n + 1];
+    end = strchr(begin, '/');
+    if (end == NULL) end = begin + strlen(begin);
+    mg_snprintf(buf, sizeof(buf), "%.*s", (int) (end - begin), begin);
+    buf[sizeof(buf) - 1] = '\0';
+    // If this entry has been already listed, skip
+    // NOTE: we're assuming that file list is sorted alphabetically
+    if (strcmp(buf, tmp) == 0) continue;
+    fn(buf, userdata);  // Not yet listed, call user function
+    strcpy(tmp, buf);   // And save this entry as listed
+  }
+}
+
+static void *packed_open(const char *path, int flags) {
+  size_t size = 0;
+  const char *data = mg_unpack(path, &size, NULL);
+  struct packed_file *fp = NULL;
+  if (data == NULL) return NULL;
+  if (flags & MG_FS_WRITE) return NULL;
+  fp = (struct packed_file *) calloc(1, sizeof(*fp));
+  fp->size = size;
+  fp->data = data;
+  return (void *) fp;
+}
+
+static void packed_close(void *fp) {
+  if (fp != NULL) free(fp);
+}
+
+static size_t packed_read(void *fd, void *buf, size_t len) {
+  struct packed_file *fp = (struct packed_file *) fd;
+  if (fp->pos + len > fp->size) len = fp->size - fp->pos;
+  memcpy(buf, &fp->data[fp->pos], len);
+  fp->pos += len;
+  return len;
+}
+
+static size_t packed_write(void *fd, const void *buf, size_t len) {
+  (void) fd, (void) buf, (void) len;
+  return 0;
+}
+
+static size_t packed_seek(void *fd, size_t offset) {
+  struct packed_file *fp = (struct packed_file *) fd;
+  fp->pos = offset;
+  if (fp->pos > fp->size) fp->pos = fp->size;
+  return fp->pos;
+}
+
+static bool packed_rename(const char *from, const char *to) {
+  (void) from, (void) to;
+  return false;
+}
+
+static bool packed_remove(const char *path) {
+  (void) path;
+  return false;
+}
+
+static bool packed_mkdir(const char *path) {
+  (void) path;
+  return false;
+}
+
+struct mg_fs mg_fs_packed = {
+    packed_stat,  packed_list, packed_open,   packed_close,  packed_read,
+    packed_write, packed_seek, packed_rename, packed_remove, packed_mkdir};
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/fs_posix.c"
+#endif
+
+
+#if MG_ENABLE_FILE
+
+#ifndef MG_STAT_STRUCT
+#define MG_STAT_STRUCT stat
+#endif
+
+#ifndef MG_STAT_FUNC
+#define MG_STAT_FUNC stat
+#endif
+
+static int p_stat(const char *path, size_t *size, time_t *mtime) {
+#if !defined(S_ISDIR)
+  MG_ERROR(("stat() API is not supported. %p %p %p", path, size, mtime));
+  return 0;
+#else
+#if MG_ARCH == MG_ARCH_WIN32
+  struct _stati64 st;
+  wchar_t tmp[PATH_MAX];
+  MultiByteToWideChar(CP_UTF8, 0, path, -1, tmp, sizeof(tmp) / sizeof(tmp[0]));
+  if (_wstati64(tmp, &st) != 0) return 0;
+#else
+  struct MG_STAT_STRUCT st;
+  if (MG_STAT_FUNC(path, &st) != 0) return 0;
+#endif
+  if (size) *size = (size_t) st.st_size;
+  if (mtime) *mtime = st.st_mtime;
+  return MG_FS_READ | MG_FS_WRITE | (S_ISDIR(st.st_mode) ? MG_FS_DIR : 0);
+#endif
+}
+
+#if MG_ARCH == MG_ARCH_WIN32
+struct dirent {
+  char d_name[MAX_PATH];
+};
+
+typedef struct win32_dir {
+  HANDLE handle;
+  WIN32_FIND_DATAW info;
+  struct dirent result;
+} DIR;
+
+int gettimeofday(struct timeval *tv, void *tz) {
+  FILETIME ft;
+  unsigned __int64 tmpres = 0;
+
+  if (tv != NULL) {
+    GetSystemTimeAsFileTime(&ft);
+    tmpres |= ft.dwHighDateTime;
+    tmpres <<= 32;
+    tmpres |= ft.dwLowDateTime;
+    tmpres /= 10;  // convert into microseconds
+    tmpres -= (int64_t) 11644473600000000;
+    tv->tv_sec = (long) (tmpres / 1000000UL);
+    tv->tv_usec = (long) (tmpres % 1000000UL);
+  }
+  (void) tz;
+  return 0;
+}
+
+static int to_wchar(const char *path, wchar_t *wbuf, size_t wbuf_len) {
+  int ret;
+  char buf[MAX_PATH * 2], buf2[MAX_PATH * 2], *p;
+  strncpy(buf, path, sizeof(buf));
+  buf[sizeof(buf) - 1] = '\0';
+  // Trim trailing slashes. Leave backslash for paths like "X:\"
+  p = buf + strlen(buf) - 1;
+  while (p > buf && p[-1] != ':' && (p[0] == '\\' || p[0] == '/')) *p-- = '\0';
+  memset(wbuf, 0, wbuf_len * sizeof(wchar_t));
+  ret = MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len);
+  // Convert back to Unicode. If doubly-converted string does not match the
+  // original, something is fishy, reject.
+  WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2),
+                      NULL, NULL);
+  if (strcmp(buf, buf2) != 0) {
+    wbuf[0] = L'\0';
+    ret = 0;
+  }
+  return ret;
+}
+
+DIR *opendir(const char *name) {
+  DIR *d = NULL;
+  wchar_t wpath[MAX_PATH];
+  DWORD attrs;
+
+  if (name == NULL) {
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  } else if ((d = (DIR *) calloc(1, sizeof(*d))) == NULL) {
+    SetLastError(ERROR_NOT_ENOUGH_MEMORY);
+  } else {
+    to_wchar(name, wpath, sizeof(wpath) / sizeof(wpath[0]));
+    attrs = GetFileAttributesW(wpath);
+    if (attrs != 0Xffffffff && (attrs & FILE_ATTRIBUTE_DIRECTORY)) {
+      (void) wcscat(wpath, L"\\*");
+      d->handle = FindFirstFileW(wpath, &d->info);
+      d->result.d_name[0] = '\0';
+    } else {
+      free(d);
+      d = NULL;
+    }
+  }
+  return d;
+}
+
+int closedir(DIR *d) {
+  int result = 0;
+  if (d != NULL) {
+    if (d->handle != INVALID_HANDLE_VALUE)
+      result = FindClose(d->handle) ? 0 : -1;
+    free(d);
+  } else {
+    result = -1;
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  }
+  return result;
+}
+
+struct dirent *readdir(DIR *d) {
+  struct dirent *result = NULL;
+  if (d != NULL) {
+    memset(&d->result, 0, sizeof(d->result));
+    if (d->handle != INVALID_HANDLE_VALUE) {
+      result = &d->result;
+      WideCharToMultiByte(CP_UTF8, 0, d->info.cFileName, -1, result->d_name,
+                          sizeof(result->d_name), NULL, NULL);
+      if (!FindNextFileW(d->handle, &d->info)) {
+        FindClose(d->handle);
+        d->handle = INVALID_HANDLE_VALUE;
+      }
+    } else {
+      SetLastError(ERROR_FILE_NOT_FOUND);
+    }
+  } else {
+    SetLastError(ERROR_BAD_ARGUMENTS);
+  }
+  return result;
+}
+#endif
+
+static void p_list(const char *dir, void (*fn)(const char *, void *),
+                   void *userdata) {
+#if MG_ENABLE_DIRLIST
+  struct dirent *dp;
+  DIR *dirp;
+  if ((dirp = (opendir(dir))) == NULL) return;
+  while ((dp = readdir(dirp)) != NULL) {
+    if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) continue;
+    fn(dp->d_name, userdata);
+  }
+  closedir(dirp);
+#else
+  (void) dir, (void) fn, (void) userdata;
+#endif
+}
+
+static void *p_open(const char *path, int flags) {
+  const char *mode = flags == MG_FS_READ ? "rb" : "a+b";
+#if MG_ARCH == MG_ARCH_WIN32
+  wchar_t b1[PATH_MAX], b2[10];
+  MultiByteToWideChar(CP_UTF8, 0, path, -1, b1, sizeof(b1) / sizeof(b1[0]));
+  MultiByteToWideChar(CP_UTF8, 0, mode, -1, b2, sizeof(b2) / sizeof(b2[0]));
+  return (void *) _wfopen(b1, b2);
+#else
+  return (void *) fopen(path, mode);
+#endif
+}
+
+static void p_close(void *fp) {
+  fclose((FILE *) fp);
+}
+
+static size_t p_read(void *fp, void *buf, size_t len) {
+  return fread(buf, 1, len, (FILE *) fp);
+}
+
+static size_t p_write(void *fp, const void *buf, size_t len) {
+  return fwrite(buf, 1, len, (FILE *) fp);
+}
+
+static size_t p_seek(void *fp, size_t offset) {
+#if (defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64) ||  \
+    (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || \
+    (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 600)
+  fseeko((FILE *) fp, (off_t) offset, SEEK_SET);
+#else
+  fseek((FILE *) fp, (long) offset, SEEK_SET);
+#endif
+  return (size_t) ftell((FILE *) fp);
+}
+
+static bool p_rename(const char *from, const char *to) {
+  return rename(from, to) == 0;
+}
+
+static bool p_remove(const char *path) {
+  return remove(path) == 0;
+}
+
+static bool p_mkdir(const char *path) {
+  return mkdir(path, 0775) == 0;
+}
+
+#else
+
+static int p_stat(const char *path, size_t *size, time_t *mtime) {
+  (void) path, (void) size, (void) mtime;
+  return 0;
+}
+static void p_list(const char *path, void (*fn)(const char *, void *),
+                   void *userdata) {
+  (void) path, (void) fn, (void) userdata;
+}
+static void *p_open(const char *path, int flags) {
+  (void) path, (void) flags;
+  return NULL;
+}
+static void p_close(void *fp) {
+  (void) fp;
+}
+static size_t p_read(void *fd, void *buf, size_t len) {
+  (void) fd, (void) buf, (void) len;
+  return 0;
+}
+static size_t p_write(void *fd, const void *buf, size_t len) {
+  (void) fd, (void) buf, (void) len;
+  return 0;
+}
+static size_t p_seek(void *fd, size_t offset) {
+  (void) fd, (void) offset;
+  return (size_t) ~0;
+}
+static bool p_rename(const char *from, const char *to) {
+  (void) from, (void) to;
+  return false;
+}
+static bool p_remove(const char *path) {
+  (void) path;
+  return false;
+}
+static bool p_mkdir(const char *path) {
+  (void) path;
+  return false;
+}
+#endif
+
+struct mg_fs mg_fs_posix = {p_stat,  p_list, p_open,   p_close,  p_read,
+                            p_write, p_seek, p_rename, p_remove, p_mkdir};
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/http.c"
+#endif
+
+
+
+
+
+
+
+
+
+
+// Multipart POST example:
+// --xyz
+// Content-Disposition: form-data; name="val"
+//
+// abcdef
+// --xyz
+// Content-Disposition: form-data; name="foo"; filename="a.txt"
+// Content-Type: text/plain
+//
+// hello world
+//
+// --xyz--
+size_t mg_http_next_multipart(struct mg_str body, size_t ofs,
+                              struct mg_http_part *part) {
+  struct mg_str cd = mg_str_n("Content-Disposition", 19);
+  const char *s = body.ptr;
+  size_t b = ofs, h1, h2, b1, b2, max = body.len;
+
+  // Init part params
+  if (part != NULL) part->name = part->filename = part->body = mg_str_n(0, 0);
+
+  // Skip boundary
+  while (b + 2 < max && s[b] != '\r' && s[b + 1] != '\n') b++;
+  if (b <= ofs || b + 2 >= max) return 0;
+  // MG_INFO(("B: %zu %zu [%.*s]", ofs, b - ofs, (int) (b - ofs), s));
+
+  // Skip headers
+  h1 = h2 = b + 2;
+  for (;;) {
+    while (h2 + 2 < max && s[h2] != '\r' && s[h2 + 1] != '\n') h2++;
+    if (h2 == h1) break;
+    if (h2 + 2 >= max) return 0;
+    // MG_INFO(("Header: [%.*s]", (int) (h2 - h1), &s[h1]));
+    if (part != NULL && h1 + cd.len + 2 < h2 && s[h1 + cd.len] == ':' &&
+        mg_ncasecmp(&s[h1], cd.ptr, cd.len) == 0) {
+      struct mg_str v = mg_str_n(&s[h1 + cd.len + 2], h2 - (h1 + cd.len + 2));
+      part->name = mg_http_get_header_var(v, mg_str_n("name", 4));
+      part->filename = mg_http_get_header_var(v, mg_str_n("filename", 8));
+    }
+    h1 = h2 = h2 + 2;
+  }
+  b1 = b2 = h2 + 2;
+  while (b2 + 2 + (b - ofs) + 2 < max && !(s[b2] == '\r' && s[b2 + 1] == '\n' &&
+                                           memcmp(&s[b2 + 2], s, b - ofs) == 0))
+    b2++;
+
+  if (b2 + 2 >= max) return 0;
+  if (part != NULL) part->body = mg_str_n(&s[b1], b2 - b1);
+  // MG_INFO(("Body: [%.*s]", (int) (b2 - b1), &s[b1]));
+  return b2 + 2;
+}
+
+void mg_http_bauth(struct mg_connection *c, const char *user,
+                   const char *pass) {
+  struct mg_str u = mg_str(user), p = mg_str(pass);
+  size_t need = c->send.len + 36 + (u.len + p.len) * 2;
+  if (c->send.size < need) mg_iobuf_resize(&c->send, need);
+  if (c->send.size >= need) {
+    int i, n = 0;
+    char *buf = (char *) &c->send.buf[c->send.len + 21];
+    memcpy(&buf[-21], "Authorization: Basic ", 21);  // DON'T use mg_send!
+    for (i = 0; i < (int) u.len; i++) {
+      n = mg_base64_update(((unsigned char *) u.ptr)[i], buf, n);
+    }
+    if (p.len > 0) {
+      n = mg_base64_update(':', buf, n);
+      for (i = 0; i < (int) p.len; i++) {
+        n = mg_base64_update(((unsigned char *) p.ptr)[i], buf, n);
+      }
+    }
+    n = mg_base64_final(buf, n);
+    c->send.len += 21 + (size_t) n + 2;
+    memcpy(&c->send.buf[c->send.len - 2], "\r\n", 2);
+  } else {
+    MG_ERROR(("%lu %s cannot resize iobuf %d->%d ", c->id, c->label,
+              (int) c->send.size, (int) need));
+  }
+}
+
+int mg_http_get_var(const struct mg_str *buf, const char *name, char *dst,
+                    size_t dst_len) {
+  const char *p, *e, *s;
+  size_t name_len;
+  int len;
+
+  if (dst == NULL || dst_len == 0) {
+    len = -2;  // Bad destination
+  } else if (buf->ptr == NULL || name == NULL || buf->len == 0) {
+    len = -1;  // Bad source
+    dst[0] = '\0';
+  } else {
+    name_len = strlen(name);
+    e = buf->ptr + buf->len;
+    len = -4;  // Name does not exist
+    dst[0] = '\0';
+    for (p = buf->ptr; p + name_len < e; p++) {
+      if ((p == buf->ptr || p[-1] == '&') && p[name_len] == '=' &&
+          !mg_ncasecmp(name, p, name_len)) {
+        p += name_len + 1;
+        s = (const char *) memchr(p, '&', (size_t) (e - p));
+        if (s == NULL) s = e;
+        len = mg_url_decode(p, (size_t) (s - p), dst, dst_len, 1);
+        if (len < 0) len = -3;  // Failed to decode
+        break;
+      }
+    }
+  }
+  return len;
+}
+
+int mg_url_decode(const char *src, size_t src_len, char *dst, size_t dst_len,
+                  int is_form_url_encoded) {
+  size_t i, j;
+  for (i = j = 0; i < src_len && j + 1 < dst_len; i++, j++) {
+    if (src[i] == '%') {
+      // Use `i + 2 < src_len`, not `i < src_len - 2`, note small src_len
+      if (i + 2 < src_len && isxdigit(*(const unsigned char *) (src + i + 1)) &&
+          isxdigit(*(const unsigned char *) (src + i + 2))) {
+        mg_unhex(src + i + 1, 2, (uint8_t *) &dst[j]);
+        i += 2;
+      } else {
+        return -1;
+      }
+    } else if (is_form_url_encoded && src[i] == '+') {
+      dst[j] = ' ';
+    } else {
+      dst[j] = src[i];
+    }
+  }
+  if (j < dst_len) dst[j] = '\0';  // Null-terminate the destination
+  return i >= src_len && j < dst_len ? (int) j : -1;
+}
+
+int mg_http_get_request_len(const unsigned char *buf, size_t buf_len) {
+  size_t i;
+  for (i = 0; i < buf_len; i++) {
+    if (!isprint(buf[i]) && buf[i] != '\r' && buf[i] != '\n' && buf[i] < 128)
+      return -1;
+    if ((i > 0 && buf[i] == '\n' && buf[i - 1] == '\n') ||
+        (i > 3 && buf[i] == '\n' && buf[i - 1] == '\r' && buf[i - 2] == '\n'))
+      return (int) i + 1;
+  }
+  return 0;
+}
+
+static const char *skip(const char *s, const char *e, const char *d,
+                        struct mg_str *v) {
+  v->ptr = s;
+  while (s < e && *s != '\n' && strchr(d, *s) == NULL) s++;
+  v->len = (size_t) (s - v->ptr);
+  while (s < e && strchr(d, *s) != NULL) s++;
+  return s;
+}
+
+struct mg_str *mg_http_get_header(struct mg_http_message *h, const char *name) {
+  size_t i, n = strlen(name), max = sizeof(h->headers) / sizeof(h->headers[0]);
+  for (i = 0; i < max && h->headers[i].name.len > 0; i++) {
+    struct mg_str *k = &h->headers[i].name, *v = &h->headers[i].value;
+    if (n == k->len && mg_ncasecmp(k->ptr, name, n) == 0) return v;
+  }
+  return NULL;
+}
+
+static void mg_http_parse_headers(const char *s, const char *end,
+                                  struct mg_http_header *h, int max_headers) {
+  int i;
+  for (i = 0; i < max_headers; i++) {
+    struct mg_str k, v, tmp;
+    const char *he = skip(s, end, "\n", &tmp);
+    s = skip(s, he, ": \r\n", &k);
+    s = skip(s, he, "\r\n", &v);
+    if (k.len == tmp.len) continue;
+    while (v.len > 0 && v.ptr[v.len - 1] == ' ') v.len--;  // Trim spaces
+    if (k.len == 0) break;
+    // MG_INFO(("--HH [%.*s] [%.*s] [%.*s]", (int) tmp.len - 1, tmp.ptr,
+    //(int) k.len, k.ptr, (int) v.len, v.ptr));
+    h[i].name = k;
+    h[i].value = v;
+  }
+}
+
+int mg_http_parse(const char *s, size_t len, struct mg_http_message *hm) {
+  int is_response, req_len = mg_http_get_request_len((unsigned char *) s, len);
+  const char *end = s + req_len, *qs;
+  struct mg_str *cl;
+
+  memset(hm, 0, sizeof(*hm));
+  if (req_len <= 0) return req_len;
+
+  hm->message.ptr = hm->head.ptr = s;
+  hm->body.ptr = end;
+  hm->head.len = (size_t) req_len;
+  hm->chunk.ptr = end;
+  hm->message.len = hm->body.len = (size_t) ~0;  // Set body length to infinite
+
+  // Parse request line
+  s = skip(s, end, " ", &hm->method);
+  s = skip(s, end, " ", &hm->uri);
+  s = skip(s, end, "\r\n", &hm->proto);
+
+  // Sanity check. Allow protocol/reason to be empty
+  if (hm->method.len == 0 || hm->uri.len == 0) return -1;
+
+  // If URI contains '?' character, setup query string
+  if ((qs = (const char *) memchr(hm->uri.ptr, '?', hm->uri.len)) != NULL) {
+    hm->query.ptr = qs + 1;
+    hm->query.len = (size_t) (&hm->uri.ptr[hm->uri.len] - (qs + 1));
+    hm->uri.len = (size_t) (qs - hm->uri.ptr);
+  }
+
+  mg_http_parse_headers(s, end, hm->headers,
+                        sizeof(hm->headers) / sizeof(hm->headers[0]));
+  if ((cl = mg_http_get_header(hm, "Content-Length")) != NULL) {
+    hm->body.len = (size_t) mg_to64(*cl);
+    hm->message.len = (size_t) req_len + hm->body.len;
+  }
+
+  // mg_http_parse() is used to parse both HTTP requests and HTTP
+  // responses. If HTTP response does not have Content-Length set, then
+  // body is read until socket is closed, i.e. body.len is infinite (~0).
+  //
+  // For HTTP requests though, according to
+  // http://tools.ietf.org/html/rfc7231#section-8.1.3,
+  // only POST and PUT methods have defined body semantics.
+  // Therefore, if Content-Length is not specified and methods are
+  // not one of PUT or POST, set body length to 0.
+  //
+  // So, if it is HTTP request, and Content-Length is not set,
+  // and method is not (PUT or POST) then reset body length to zero.
+  is_response = mg_ncasecmp(hm->method.ptr, "HTTP/", 5) == 0;
+  if (hm->body.len == (size_t) ~0 && !is_response &&
+      mg_vcasecmp(&hm->method, "PUT") != 0 &&
+      mg_vcasecmp(&hm->method, "POST") != 0) {
+    hm->body.len = 0;
+    hm->message.len = (size_t) req_len;
+  }
+
+  // The 204 (No content) responses also have 0 body length
+  if (hm->body.len == (size_t) ~0 && is_response &&
+      mg_vcasecmp(&hm->uri, "204") == 0) {
+    hm->body.len = 0;
+    hm->message.len = (size_t) req_len;
+  }
+
+  return req_len;
+}
+
+static void mg_http_vprintf_chunk(struct mg_connection *c, const char *fmt,
+                                  va_list ap) {
+  char mem[256], *buf = mem;
+  size_t len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  mg_printf(c, "%lx\r\n", (unsigned long) len);
+  mg_send(c, buf, len > 0 ? (size_t) len : 0);
+  mg_send(c, "\r\n", 2);
+  if (buf != mem) free(buf);
+}
+
+void mg_http_printf_chunk(struct mg_connection *c, const char *fmt, ...) {
+  va_list ap;
+  va_start(ap, fmt);
+  mg_http_vprintf_chunk(c, fmt, ap);
+  va_end(ap);
+}
+
+void mg_http_write_chunk(struct mg_connection *c, const char *buf, size_t len) {
+  mg_printf(c, "%lx\r\n", (unsigned long) len);
+  mg_send(c, buf, len);
+  mg_send(c, "\r\n", 2);
+}
+
+// clang-format off
+static const char *mg_http_status_code_str(int status_code) {
+  switch (status_code) {
+    case 100: return "Continue";
+    case 101: return "Switching Protocols";
+    case 102: return "Processing";
+    case 200: return "OK";
+    case 201: return "Created";
+    case 202: return "Accepted";
+    case 203: return "Non-authoritative Information";
+    case 204: return "No Content";
+    case 205: return "Reset Content";
+    case 206: return "Partial Content";
+    case 207: return "Multi-Status";
+    case 208: return "Already Reported";
+    case 226: return "IM Used";
+    case 300: return "Multiple Choices";
+    case 301: return "Moved Permanently";
+    case 302: return "Found";
+    case 303: return "See Other";
+    case 304: return "Not Modified";
+    case 305: return "Use Proxy";
+    case 307: return "Temporary Redirect";
+    case 308: return "Permanent Redirect";
+    case 400: return "Bad Request";
+    case 401: return "Unauthorized";
+    case 402: return "Payment Required";
+    case 403: return "Forbidden";
+    case 404: return "Not Found";
+    case 405: return "Method Not Allowed";
+    case 406: return "Not Acceptable";
+    case 407: return "Proxy Authentication Required";
+    case 408: return "Request Timeout";
+    case 409: return "Conflict";
+    case 410: return "Gone";
+    case 411: return "Length Required";
+    case 412: return "Precondition Failed";
+    case 413: return "Payload Too Large";
+    case 414: return "Request-URI Too Long";
+    case 415: return "Unsupported Media Type";
+    case 416: return "Requested Range Not Satisfiable";
+    case 417: return "Expectation Failed";
+    case 418: return "I'm a teapot";
+    case 421: return "Misdirected Request";
+    case 422: return "Unprocessable Entity";
+    case 423: return "Locked";
+    case 424: return "Failed Dependency";
+    case 426: return "Upgrade Required";
+    case 428: return "Precondition Required";
+    case 429: return "Too Many Requests";
+    case 431: return "Request Header Fields Too Large";
+    case 444: return "Connection Closed Without Response";
+    case 451: return "Unavailable For Legal Reasons";
+    case 499: return "Client Closed Request";
+    case 500: return "Internal Server Error";
+    case 501: return "Not Implemented";
+    case 502: return "Bad Gateway";
+    case 503: return "Service Unavailable";
+    case 504: return "Gateway Timeout";
+    case 505: return "HTTP Version Not Supported";
+    case 506: return "Variant Also Negotiates";
+    case 507: return "Insufficient Storage";
+    case 508: return "Loop Detected";
+    case 510: return "Not Extended";
+    case 511: return "Network Authentication Required";
+    case 599: return "Network Connect Timeout Error";
+    default: return "OK";
+  }
+}
+// clang-format on
+
+void mg_http_reply(struct mg_connection *c, int code, const char *headers,
+                   const char *fmt, ...) {
+  char mem[256], *buf = mem;
+  va_list ap;
+  size_t len;
+  va_start(ap, fmt);
+  len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  va_end(ap);
+  mg_printf(c, "HTTP/1.1 %d %s\r\n%sContent-Length: %d\r\n\r\n", code,
+            mg_http_status_code_str(code), headers == NULL ? "" : headers, len);
+  mg_send(c, buf, len > 0 ? len : 0);
+  if (buf != mem) free(buf);
+}
+
+static void http_cb(struct mg_connection *, int, void *, void *);
+static void restore_http_cb(struct mg_connection *c) {
+  mg_fs_close((struct mg_fd *) c->pfn_data);
+  c->pfn_data = NULL;
+  c->pfn = http_cb;
+}
+
+char *mg_http_etag(char *buf, size_t len, size_t size, time_t mtime);
+char *mg_http_etag(char *buf, size_t len, size_t size, time_t mtime) {
+  mg_snprintf(buf, len, "\"%lld.%lld\"", (int64_t) mtime, (int64_t) size);
+  return buf;
+}
+
+static void static_cb(struct mg_connection *c, int ev, void *ev_data,
+                      void *fn_data) {
+  if (ev == MG_EV_WRITE || ev == MG_EV_POLL) {
+    struct mg_fd *fd = (struct mg_fd *) fn_data;
+    // Read to send IO buffer directly, avoid extra on-stack buffer
+    size_t n, max = 2 * MG_IO_SIZE;
+    if (c->send.size < max) mg_iobuf_resize(&c->send, max);
+    if (c->send.len > 0) return;  // Wait until drained: for some LWIP setups
+    n = fd->fs->rd(fd->fd, c->send.buf + c->send.len,
+                   c->send.size - c->send.len);
+    c->send.len += n;
+    if (n == 0) restore_http_cb(c);
+  } else if (ev == MG_EV_CLOSE) {
+    restore_http_cb(c);
+  }
+  (void) ev_data;
+}
+
+static struct mg_str guess_content_type(struct mg_str path, const char *extra) {
+  struct mg_str k, v, s = mg_str(extra);
+  size_t i = 0;
+
+  // clang-format off
+  struct mg_str tab[] = {
+      MG_C_STR("html"), MG_C_STR("text/html; charset=utf-8"),
+      MG_C_STR("htm"), MG_C_STR("text/html; charset=utf-8"),
+      MG_C_STR("css"), MG_C_STR("text/css; charset=utf-8"),
+      MG_C_STR("js"), MG_C_STR("text/javascript; charset=utf-8"),
+      MG_C_STR("gif"), MG_C_STR("image/gif"),
+      MG_C_STR("png"), MG_C_STR("image/png"),
+      MG_C_STR("jpg"), MG_C_STR("image/jpeg"),
+      MG_C_STR("jpeg"), MG_C_STR("image/jpeg"),
+      MG_C_STR("woff"), MG_C_STR("font/woff"),
+      MG_C_STR("ttf"), MG_C_STR("font/ttf"),
+      MG_C_STR("svg"), MG_C_STR("image/svg+xml"),
+      MG_C_STR("txt"), MG_C_STR("text/plain; charset=utf-8"),
+      MG_C_STR("avi"), MG_C_STR("video/x-msvideo"),
+      MG_C_STR("csv"), MG_C_STR("text/csv"),
+      MG_C_STR("doc"), MG_C_STR("application/msword"),
+      MG_C_STR("exe"), MG_C_STR("application/octet-stream"),
+      MG_C_STR("gz"), MG_C_STR("application/gzip"),
+      MG_C_STR("ico"), MG_C_STR("image/x-icon"),
+      MG_C_STR("json"), MG_C_STR("application/json"),
+      MG_C_STR("mov"), MG_C_STR("video/quicktime"),
+      MG_C_STR("mp3"), MG_C_STR("audio/mpeg"),
+      MG_C_STR("mp4"), MG_C_STR("video/mp4"),
+      MG_C_STR("mpeg"), MG_C_STR("video/mpeg"),
+      MG_C_STR("pdf"), MG_C_STR("application/pdf"),
+      MG_C_STR("shtml"), MG_C_STR("text/html; charset=utf-8"),
+      MG_C_STR("tgz"), MG_C_STR("application/tar-gz"),
+      MG_C_STR("wav"), MG_C_STR("audio/wav"),
+      MG_C_STR("webp"), MG_C_STR("image/webp"),
+      MG_C_STR("zip"), MG_C_STR("application/zip"),
+      MG_C_STR("3gp"), MG_C_STR("video/3gpp"),
+      {0, 0},
+  };
+  // clang-format on
+
+  // Shrink path to its extension only
+  while (i < path.len && path.ptr[path.len - i - 1] != '.') i++;
+  path.ptr += path.len - i;
+  path.len = i;
+
+  // Process user-provided mime type overrides, if any
+  while (mg_commalist(&s, &k, &v)) {
+    if (mg_strcmp(path, k) == 0) return v;
+  }
+
+  // Process built-in mime types
+  for (i = 0; tab[i].ptr != NULL; i += 2) {
+    if (mg_strcmp(path, tab[i]) == 0) return tab[i + 1];
+  }
+
+  return mg_str("text/plain; charset=utf-8");
+}
+
+static int getrange(struct mg_str *s, int64_t *a, int64_t *b) {
+  size_t i, numparsed = 0;
+  // MG_INFO(("%.*s", (int) s->len, s->ptr));
+  for (i = 0; i + 6 < s->len; i++) {
+    if (memcmp(&s->ptr[i], "bytes=", 6) == 0) {
+      struct mg_str p = mg_str_n(s->ptr + i + 6, s->len - i - 6);
+      if (p.len > 0 && p.ptr[0] >= '0' && p.ptr[0] <= '9') numparsed++;
+      *a = mg_to64(p);
+      // MG_INFO(("PPP [%.*s] %d", (int) p.len, p.ptr, numparsed));
+      while (p.len && p.ptr[0] >= '0' && p.ptr[0] <= '9') p.ptr++, p.len--;
+      if (p.len && p.ptr[0] == '-') p.ptr++, p.len--;
+      *b = mg_to64(p);
+      if (p.len > 0 && p.ptr[0] >= '0' && p.ptr[0] <= '9') numparsed++;
+      // MG_INFO(("PPP [%.*s] %d", (int) p.len, p.ptr, numparsed));
+      break;
+    }
+  }
+  return (int) numparsed;
+}
+
+void mg_http_serve_file(struct mg_connection *c, struct mg_http_message *hm,
+                        const char *path, struct mg_http_serve_opts *opts) {
+  char etag[64];
+  struct mg_fs *fs = opts->fs == NULL ? &mg_fs_posix : opts->fs;
+  struct mg_fd *fd = mg_fs_open(fs, path, MG_FS_READ);
+  size_t size = 0;
+  time_t mtime = 0;
+  struct mg_str *inm = NULL;
+
+  if (fd == NULL || fs->st(path, &size, &mtime) == 0) {
+    MG_DEBUG(("404 [%s] %p", path, (void *) fd));
+    mg_http_reply(c, 404, "", "%s", "Not found\n");
+    mg_fs_close(fd);
+    // NOTE: mg_http_etag() call should go first!
+  } else if (mg_http_etag(etag, sizeof(etag), size, mtime) != NULL &&
+             (inm = mg_http_get_header(hm, "If-None-Match")) != NULL &&
+             mg_vcasecmp(inm, etag) == 0) {
+    mg_fs_close(fd);
+    mg_printf(c, "HTTP/1.1 304 Not Modified\r\nContent-Length: 0\r\n\r\n");
+  } else {
+    int n, status = 200;
+    char range[100] = "";
+    int64_t r1 = 0, r2 = 0, cl = (int64_t) size;
+    struct mg_str mime = guess_content_type(mg_str(path), opts->mime_types);
+
+    // Handle Range header
+    struct mg_str *rh = mg_http_get_header(hm, "Range");
+    if (rh != NULL && (n = getrange(rh, &r1, &r2)) > 0 && r1 >= 0 && r2 >= 0) {
+      // If range is specified like "400-", set second limit to content len
+      if (n == 1) r2 = cl - 1;
+      if (r1 > r2 || r2 >= cl) {
+        status = 416;
+        cl = 0;
+        mg_snprintf(range, sizeof(range), "Content-Range: bytes */%lld\r\n",
+                    (int64_t) size);
+      } else {
+        status = 206;
+        cl = r2 - r1 + 1;
+        mg_snprintf(range, sizeof(range),
+                    "Content-Range: bytes %lld-%lld/%lld\r\n", r1, r1 + cl - 1,
+                    (int64_t) size);
+        fs->sk(fd->fd, (size_t) r1);
+      }
+    }
+    mg_printf(c,
+              "HTTP/1.1 %d %s\r\n"
+              "Content-Type: %.*s\r\n"
+              "Etag: %s\r\n"
+              "Content-Length: %llu\r\n"
+              "%s%s\r\n",
+              status, mg_http_status_code_str(status), (int) mime.len, mime.ptr,
+              etag, cl, range, opts->extra_headers ? opts->extra_headers : "");
+    if (mg_vcasecmp(&hm->method, "HEAD") == 0) {
+      c->is_draining = 1;
+      mg_fs_close(fd);
+    } else {
+      c->pfn = static_cb;
+      c->pfn_data = fd;
+    }
+  }
+}
+
+struct printdirentrydata {
+  struct mg_connection *c;
+  struct mg_http_message *hm;
+  struct mg_http_serve_opts *opts;
+  const char *dir;
+};
+
+static void printdirentry(const char *name, void *userdata) {
+  struct printdirentrydata *d = (struct printdirentrydata *) userdata;
+  struct mg_fs *fs = d->opts->fs == NULL ? &mg_fs_posix : d->opts->fs;
+  size_t size = 0;
+  time_t t = 0;
+  char path[MG_PATH_MAX], sz[40], mod[40];
+  int flags, n = 0;
+
+  // MG_DEBUG(("[%s] [%s]", d->dir, name));
+  if (mg_snprintf(path, sizeof(path), "%s%c%s", d->dir, '/', name) >
+      sizeof(path)) {
+    MG_ERROR(("%s truncated", name));
+  } else if ((flags = fs->st(path, &size, &t)) == 0) {
+    MG_ERROR(("%lu stat(%s): %d", d->c->id, path, errno));
+  } else {
+    const char *slash = flags & MG_FS_DIR ? "/" : "";
+    if (flags & MG_FS_DIR) {
+      mg_snprintf(sz, sizeof(sz), "%s", "[DIR]");
+    } else {
+      mg_snprintf(sz, sizeof(sz), "%lld", (uint64_t) size);
+    }
+    mg_snprintf(mod, sizeof(mod), "%ld", (unsigned long) t);
+    n = (int) mg_url_encode(name, strlen(name), path, sizeof(path));
+    mg_printf(d->c,
+              "  <tr><td><a href=\"%.*s%s\">%s%s</a></td>"
+              "<td name=%lu>%s</td><td name=%lld>%s</td></tr>\n",
+              n, path, slash, name, slash, (unsigned long) t, mod,
+              flags & MG_FS_DIR ? (int64_t) -1 : (int64_t) size, sz);
+  }
+}
+
+static void listdir(struct mg_connection *c, struct mg_http_message *hm,
+                    struct mg_http_serve_opts *opts, char *dir) {
+  static const char *sort_js_code =
+      "<script>function srt(tb, sc, so, d) {"
+      "var tr = Array.prototype.slice.call(tb.rows, 0),"
+      "tr = tr.sort(function (a, b) { var c1 = a.cells[sc], c2 = b.cells[sc],"
+      "n1 = c1.getAttribute('name'), n2 = c2.getAttribute('name'), "
+      "t1 = a.cells[2].getAttribute('name'), "
+      "t2 = b.cells[2].getAttribute('name'); "
+      "return so * (t1 < 0 && t2 >= 0 ? -1 : t2 < 0 && t1 >= 0 ? 1 : "
+      "n1 ? parseInt(n2) - parseInt(n1) : "
+      "c1.textContent.trim().localeCompare(c2.textContent.trim())); });";
+  static const char *sort_js_code2 =
+      "for (var i = 0; i < tr.length; i++) tb.appendChild(tr[i]); "
+      "if (!d) window.location.hash = ('sc=' + sc + '&so=' + so); "
+      "};"
+      "window.onload = function() {"
+      "var tb = document.getElementById('tb');"
+      "var m = /sc=([012]).so=(1|-1)/.exec(window.location.hash) || [0, 2, 1];"
+      "var sc = m[1], so = m[2]; document.onclick = function(ev) { "
+      "var c = ev.target.rel; if (c) {if (c == sc) so *= -1; srt(tb, c, so); "
+      "sc = c; ev.preventDefault();}};"
+      "srt(tb, sc, so, true);"
+      "}"
+      "</script>";
+  struct mg_fs *fs = opts->fs == NULL ? &mg_fs_posix : opts->fs;
+  struct printdirentrydata d = {c, hm, opts, dir};
+  char tmp[10], buf[MG_PATH_MAX];
+  size_t off, n;
+  int len = mg_url_decode(hm->uri.ptr, hm->uri.len, buf, sizeof(buf), 0);
+  struct mg_str uri = len > 0 ? mg_str_n(buf, (size_t) len) : hm->uri;
+
+  mg_printf(c,
+            "HTTP/1.1 200 OK\r\n"
+            "Content-Type: text/html; charset=utf-8\r\n"
+            "%s"
+            "Content-Length:         \r\n\r\n",
+            opts->extra_headers == NULL ? "" : opts->extra_headers);
+  off = c->send.len;  // Start of body
+  mg_printf(c,
+            "<!DOCTYPE html><html><head><title>Index of %.*s</title>%s%s"
+            "<style>th,td {text-align: left; padding-right: 1em; "
+            "font-family: monospace; }</style></head>"
+            "<body><h1>Index of %.*s</h1><table cellpadding=\"0\"><thead>"
+            "<tr><th><a href=\"#\" rel=\"0\">Name</a></th><th>"
+            "<a href=\"#\" rel=\"1\">Modified</a></th>"
+            "<th><a href=\"#\" rel=\"2\">Size</a></th></tr>"
+            "<tr><td colspan=\"3\"><hr></td></tr>"
+            "</thead>"
+            "<tbody id=\"tb\">\n",
+            (int) uri.len, uri.ptr, sort_js_code, sort_js_code2, (int) uri.len,
+            uri.ptr);
+  mg_printf(c, "%s",
+            "  <tr><td><a href=\"..\">..</a></td>"
+            "<td name=-1></td><td name=-1>[DIR]</td></tr>\n");
+
+  fs->ls(dir, printdirentry, &d);
+  mg_printf(c,
+            "</tbody><tfoot><tr><td colspan=\"3\"><hr></td></tr></tfoot>"
+            "</table><address>Mongoose v.%s</address></body></html>\n",
+            MG_VERSION);
+  n = mg_snprintf(tmp, sizeof(tmp), "%lu", (unsigned long) (c->send.len - off));
+  if (n > sizeof(tmp)) n = 0;
+  memcpy(c->send.buf + off - 10, tmp, n);  // Set content length
+}
+
+static void remove_double_dots(char *s) {
+  char *p = s;
+  while (*s != '\0') {
+    *p++ = *s++;
+    if (s[-1] == '/' || s[-1] == '\\') {
+      while (s[0] != '\0') {
+        if (s[0] == '/' || s[0] == '\\') {
+          s++;
+        } else if (s[0] == '.' && s[1] == '.' &&
+                   (s[2] == '/' || s[2] == '\\')) {
+          s += 2;
+        } else {
+          break;
+        }
+      }
+    }
+  }
+  *p = '\0';
+}
+
+// Resolve requested file into `path` and return its fs->st() result
+static int uri_to_path2(struct mg_connection *c, struct mg_http_message *hm,
+                        struct mg_fs *fs, struct mg_str url, struct mg_str dir,
+                        char *path, size_t path_size) {
+  int flags = 0, tmp;
+  // Append URI to the root_dir, and sanitize it
+  size_t n = mg_snprintf(path, path_size, "%.*s", (int) dir.len, dir.ptr);
+  if (n > path_size) n = path_size;
+  path[path_size - 1] = '\0';
+  if ((fs->st(path, NULL, NULL) & MG_FS_DIR) == 0) {
+    mg_http_reply(c, 400, "", "Invalid web root [%.*s]\n", (int) dir.len,
+                  dir.ptr);
+  } else {
+    if (n + 2 < path_size) path[n++] = '/', path[n] = '\0';
+    mg_url_decode(hm->uri.ptr + url.len, hm->uri.len - url.len, path + n,
+                  path_size - n, 0);
+    path[path_size - 1] = '\0';  // Double-check
+    remove_double_dots(path);
+    n = strlen(path);
+    MG_VERBOSE(("%lu %.*s -> %s", c->id, (int) hm->uri.len, hm->uri.ptr, path));
+    while (n > 0 && path[n - 1] == '/') path[--n] = 0;  // Trim trailing slashes
+    flags = fs->st(path, NULL, NULL);                   // Does it exist?
+    if (flags == 0) {
+      mg_http_reply(c, 404, "", "Not found\n");  // Does not exist, doh
+    } else if ((flags & MG_FS_DIR) && hm->uri.len > 0 &&
+               hm->uri.ptr[hm->uri.len - 1] != '/') {
+      mg_printf(c,
+                "HTTP/1.1 301 Moved\r\n"
+                "Location: %.*s/\r\n"
+                "Content-Length: 0\r\n"
+                "\r\n",
+                (int) hm->uri.len, hm->uri.ptr);
+      flags = 0;
+    } else if (flags & MG_FS_DIR) {
+      if (((mg_snprintf(path + n, path_size - n, "/" MG_HTTP_INDEX) > 0 &&
+            (tmp = fs->st(path, NULL, NULL)) != 0) ||
+           (mg_snprintf(path + n, path_size - n, "/index.shtml") > 0 &&
+            (tmp = fs->st(path, NULL, NULL)) != 0))) {
+        flags = tmp;
+      } else {
+        path[n] = '\0';  // Remove appended index file name
+      }
+    }
+  }
+  return flags;
+}
+
+static int uri_to_path(struct mg_connection *c, struct mg_http_message *hm,
+                       struct mg_http_serve_opts *opts, char *path,
+                       size_t path_size) {
+  struct mg_fs *fs = opts->fs == NULL ? &mg_fs_posix : opts->fs;
+  struct mg_str k, v, s = mg_str(opts->root_dir), u = {0, 0}, p = {0, 0};
+  while (mg_commalist(&s, &k, &v)) {
+    if (v.len == 0) v = k, k = mg_str("/");
+    if (hm->uri.len < k.len) continue;
+    if (mg_strcmp(k, mg_str_n(hm->uri.ptr, k.len)) != 0) continue;
+    u = k, p = v;
+  }
+  return uri_to_path2(c, hm, fs, u, p, path, path_size);
+}
+
+void mg_http_serve_dir(struct mg_connection *c, struct mg_http_message *hm,
+                       struct mg_http_serve_opts *opts) {
+  char path[MG_PATH_MAX] = "";
+  const char *sp = opts->ssi_pattern;
+  int flags = uri_to_path(c, hm, opts, path, sizeof(path));
+  if (flags == 0) return;
+  MG_VERBOSE(("%.*s %s %d", (int) hm->uri.len, hm->uri.ptr, path, flags));
+  if (flags & MG_FS_DIR) {
+    listdir(c, hm, opts, path);
+  } else if (sp != NULL && mg_globmatch(sp, strlen(sp), path, strlen(path))) {
+    mg_http_serve_ssi(c, opts->root_dir, path);
+  } else {
+    mg_http_serve_file(c, hm, path, opts);
+  }
+}
+
+static bool mg_is_url_safe(int c) {
+  return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') ||
+         (c >= 'A' && c <= 'Z') || c == '.' || c == '_' || c == '-' || c == '~';
+}
+
+size_t mg_url_encode(const char *s, size_t sl, char *buf, size_t len) {
+  size_t i, n = 0;
+  for (i = 0; i < sl; i++) {
+    int c = *(unsigned char *) &s[i];
+    if (n + 4 >= len) return 0;
+    if (mg_is_url_safe(c)) {
+      buf[n++] = s[i];
+    } else {
+      buf[n++] = '%';
+      mg_hex(&s[i], 1, &buf[n]);
+      n += 2;
+    }
+  }
+  return n;
+}
+
+void mg_http_creds(struct mg_http_message *hm, char *user, size_t userlen,
+                   char *pass, size_t passlen) {
+  struct mg_str *v = mg_http_get_header(hm, "Authorization");
+  user[0] = pass[0] = '\0';
+  if (v != NULL && v->len > 6 && memcmp(v->ptr, "Basic ", 6) == 0) {
+    char buf[256];
+    int n = mg_base64_decode(v->ptr + 6, (int) v->len - 6, buf);
+    const char *p = (const char *) memchr(buf, ':', n > 0 ? (size_t) n : 0);
+    if (p != NULL) {
+      mg_snprintf(user, userlen, "%.*s", (int) (p - buf), buf);
+      mg_snprintf(pass, passlen, "%.*s", n - (int) (p - buf) - 1, p + 1);
+    }
+  } else if (v != NULL && v->len > 7 && memcmp(v->ptr, "Bearer ", 7) == 0) {
+    mg_snprintf(pass, passlen, "%.*s", (int) v->len - 7, v->ptr + 7);
+  } else if ((v = mg_http_get_header(hm, "Cookie")) != NULL) {
+    struct mg_str t = mg_http_get_header_var(*v, mg_str_n("access_token", 12));
+    if (t.len > 0) mg_snprintf(pass, passlen, "%.*s", (int) t.len, t.ptr);
+  } else {
+    mg_http_get_var(&hm->query, "access_token", pass, passlen);
+  }
+}
+
+static struct mg_str stripquotes(struct mg_str s) {
+  return s.len > 1 && s.ptr[0] == '"' && s.ptr[s.len - 1] == '"'
+             ? mg_str_n(s.ptr + 1, s.len - 2)
+             : s;
+}
+
+struct mg_str mg_http_get_header_var(struct mg_str s, struct mg_str v) {
+  size_t i;
+  for (i = 0; v.len > 0 && i + v.len + 2 < s.len; i++) {
+    if (s.ptr[i + v.len] == '=' && memcmp(&s.ptr[i], v.ptr, v.len) == 0) {
+      const char *p = &s.ptr[i + v.len + 1], *b = p, *x = &s.ptr[s.len];
+      int q = p < x && *p == '"' ? 1 : 0;
+      while (p < x &&
+             (q ? p == b || *p != '"' : *p != ';' && *p != ' ' && *p != ','))
+        p++;
+      // MG_INFO(("[%.*s] [%.*s] [%.*s]", (int) s.len, s.ptr, (int) v.len,
+      // v.ptr, (int) (p - b), b));
+      return stripquotes(mg_str_n(b, (size_t) (p - b + q)));
+    }
+  }
+  return mg_str_n(NULL, 0);
+}
+
+bool mg_http_match_uri(const struct mg_http_message *hm, const char *glob) {
+  return mg_match(hm->uri, mg_str(glob), NULL);
+}
+
+static size_t get_chunk_length(const char *buf, size_t len, size_t *ll) {
+  size_t i = 0, n;
+  while (i < len && buf[i] != '\r' && i != '\n') i++;
+  n = mg_unhexn((char *) buf, i);
+  while (i < len && (buf[i] == '\r' || i == '\n')) i++;
+  // MG_INFO(("len %zu i %zu n %zu ", len, i, n));
+  if (ll != NULL) *ll = i + 1;
+  if (i < len && i + n + 2 < len) return i + n + 3;
+  return 0;
+}
+
+// Walk through all chunks in the chunked body. For each chunk, fire
+// an MG_EV_HTTP_CHUNK event.
+static void walkchunks(struct mg_connection *c, struct mg_http_message *hm,
+                       size_t reqlen) {
+  size_t off = 0, bl, ll;
+  while (off + reqlen < c->recv.len) {
+    char *buf = (char *) &c->recv.buf[reqlen];
+    size_t memo = c->recv.len;
+    size_t cl = get_chunk_length(&buf[off], memo - reqlen - off, &ll);
+    // MG_INFO(("len %zu off %zu cl %zu ll %zu", len, off, cl, ll));
+    if (cl == 0) break;
+    hm->chunk = mg_str_n(&buf[off + ll], cl < ll + 2 ? 0 : cl - ll - 2);
+    mg_call(c, MG_EV_HTTP_CHUNK, hm);
+    // Increase offset only if user has not deleted this chunk
+    if (memo == c->recv.len) off += cl;
+    if (cl <= 5) {
+      // Zero chunk - last one. Prepare body - cut off chunk lengths
+      off = bl = 0;
+      while (off + reqlen < c->recv.len) {
+        char *buf2 = (char *) &c->recv.buf[reqlen];
+        size_t memo2 = c->recv.len;
+        size_t cl2 = get_chunk_length(&buf2[off], memo2 - reqlen - off, &ll);
+        size_t n = cl2 < ll + 2 ? 0 : cl2 - ll - 2;
+        memmove(buf2 + bl, buf2 + off + ll, n);
+        bl += n;
+        off += cl2;
+        if (cl2 <= 5) break;
+      }
+      // MG_INFO(("BL->%d del %d off %d", (int) bl, (int) del, (int) off));
+      c->recv.len -= off - bl;
+      // Set message length to indicate we've received
+      // everything, to fire MG_EV_HTTP_MSG
+      hm->message.len = bl + reqlen;
+      hm->body.len = bl;
+      break;
+    }
+  }
+}
+
+static bool mg_is_chunked(struct mg_http_message *hm) {
+  struct mg_str needle = mg_str_n("chunked", 7);
+  struct mg_str *te = mg_http_get_header(hm, "Transfer-Encoding");
+  return te != NULL && mg_strstr(*te, needle) != NULL;
+}
+
+void mg_http_delete_chunk(struct mg_connection *c, struct mg_http_message *hm) {
+  struct mg_str ch = hm->chunk;
+  const char *end = (char *) &c->recv.buf[c->recv.len], *ce;
+  bool chunked = mg_is_chunked(hm);
+  if (!mg_is_chunked(hm)) return;
+  if (chunked) {
+    ch.len += 4, ch.ptr -= 2;  // \r\n before and after the chunk
+    while (ch.ptr > hm->body.ptr && *ch.ptr != '\n') ch.ptr--, ch.len++;
+  }
+  ce = &ch.ptr[ch.len];
+  if (ce < end) memmove((void *) ch.ptr, ce, (size_t) (end - ce));
+  c->recv.len -= ch.len;
+  if (c->pfn_data != NULL) c->pfn_data = (char *) c->pfn_data - ch.len;
+}
+
+int mg_http_upload(struct mg_connection *c, struct mg_http_message *hm,
+                   struct mg_fs *fs, const char *dir) {
+  char offset[40] = "", name[200] = "", path[256];
+  mg_http_get_var(&hm->query, "offset", offset, sizeof(offset));
+  mg_http_get_var(&hm->query, "name", name, sizeof(name));
+  if (name[0] == '\0') {
+    mg_http_reply(c, 400, "", "%s", "name required");
+    return -1;
+  } else {
+    struct mg_fd *fd;
+    long oft = strtol(offset, NULL, 0);
+    mg_snprintf(path, sizeof(path), "%s%c%s", dir, MG_DIRSEP, name);
+    remove_double_dots(path);
+    MG_DEBUG(("%d bytes @ %ld [%s]", (int) hm->body.len, oft, path));
+    if (oft == 0) fs->rm(path);
+    if ((fd = mg_fs_open(fs, path, MG_FS_WRITE)) == NULL) {
+      mg_http_reply(c, 400, "", "open(%s): %d", path, errno);
+      return -2;
+    } else {
+      int written = (int) fs->wr(fd->fd, hm->body.ptr, hm->body.len);
+      mg_fs_close(fd);
+      mg_http_reply(c, 200, "", "%d", written);
+      return (int) hm->body.len;
+    }
+  }
+}
+
+int mg_http_status(const struct mg_http_message *hm) {
+  return atoi(hm->uri.ptr);
+}
+
+static void http_cb(struct mg_connection *c, int ev, void *evd, void *fnd) {
+  if (ev == MG_EV_READ || ev == MG_EV_CLOSE) {
+    struct mg_http_message hm;
+    while (c->recv.buf != NULL && c->recv.len > 0) {
+      int n = mg_http_parse((char *) c->recv.buf, c->recv.len, &hm);
+      bool is_chunked = n > 0 && mg_is_chunked(&hm);
+      if (ev == MG_EV_CLOSE) {
+        hm.message.len = c->recv.len;
+        hm.body.len = hm.message.len - (size_t) (hm.body.ptr - hm.message.ptr);
+      } else if (is_chunked && n > 0) {
+        walkchunks(c, &hm, (size_t) n);
+      }
+      // MG_INFO(("---->%d %d\n%.*s", n, is_chunked, (int) c->recv.len,
+      // c->recv.buf));
+      if (n < 0 && ev == MG_EV_READ) {
+        mg_error(c, "HTTP parse:\n%.*s", (int) c->recv.len, c->recv.buf);
+        break;
+      } else if (n > 0 && (size_t) c->recv.len >= hm.message.len) {
+        mg_call(c, MG_EV_HTTP_MSG, &hm);
+        mg_iobuf_del(&c->recv, 0, hm.message.len);
+      } else {
+        if (n > 0 && !is_chunked) {
+          hm.chunk =
+              mg_str_n((char *) &c->recv.buf[n], c->recv.len - (size_t) n);
+          // Store remaining body length in c->pfn_data
+          if (c->pfn_data == NULL)
+            c->pfn_data = (void *) (hm.message.len - (size_t) n);
+          mg_call(c, MG_EV_HTTP_CHUNK, &hm);
+          if (c->pfn_data == NULL) {
+            hm.chunk.len = 0;                   // Last chunk!
+            mg_call(c, MG_EV_HTTP_CHUNK, &hm);  // Lest user know
+            memmove(c->recv.buf, c->recv.buf + n, c->recv.len - (size_t) n);
+            c->recv.len -= (size_t) n;
+          }
+        }
+        break;
+      }
+    }
+  }
+  (void) fnd;
+  (void) evd;
+}
+
+struct mg_connection *mg_http_connect(struct mg_mgr *mgr, const char *url,
+                                      mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_connect(mgr, url, fn, fn_data);
+  if (c != NULL) c->pfn = http_cb;
+  return c;
+}
+
+struct mg_connection *mg_http_listen(struct mg_mgr *mgr, const char *url,
+                                     mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_listen(mgr, url, fn, fn_data);
+  if (c != NULL) c->pfn = http_cb;
+  return c;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/iobuf.c"
+#endif
+
+
+
+#include <string.h>
+
+// Not using memset for zeroing memory, cause it can be dropped by compiler
+// See https://github.com/cesanta/mongoose/pull/1265
+static void zeromem(volatile unsigned char *buf, size_t len) {
+  if (buf != NULL) {
+    while (len--) *buf++ = 0;
+  }
+}
+
+int mg_iobuf_resize(struct mg_iobuf *io, size_t new_size) {
+  int ok = 1;
+  if (new_size == 0) {
+    zeromem(io->buf, io->size);
+    free(io->buf);
+    io->buf = NULL;
+    io->len = io->size = 0;
+  } else if (new_size != io->size) {
+    // NOTE(lsm): do not use realloc here. Use calloc/free only, to ease the
+    // porting to some obscure platforms like FreeRTOS
+    void *p = calloc(1, new_size);
+    if (p != NULL) {
+      size_t len = new_size < io->len ? new_size : io->len;
+      if (len > 0) memcpy(p, io->buf, len);
+      zeromem(io->buf, io->size);
+      free(io->buf);
+      io->buf = (unsigned char *) p;
+      io->size = new_size;
+    } else {
+      ok = 0;
+      MG_ERROR(("%lld->%lld", (uint64_t) io->size, (uint64_t) new_size));
+    }
+  }
+  return ok;
+}
+
+int mg_iobuf_init(struct mg_iobuf *io, size_t size) {
+  return mg_iobuf_resize(io, size);
+}
+
+size_t mg_iobuf_add(struct mg_iobuf *io, size_t ofs, const void *buf,
+                    size_t len, size_t chunk_size) {
+  size_t new_size = io->len + len;
+  if (new_size > io->size) {
+    new_size += chunk_size;             // Make sure that io->size
+    new_size -= new_size % chunk_size;  // is aligned by chunk_size boundary
+    mg_iobuf_resize(io, new_size);      // Attempt to realloc
+    if (new_size != io->size) len = 0;  // Realloc failure, append nothing
+  }
+  if (ofs < io->len) memmove(io->buf + ofs + len, io->buf + ofs, io->len - ofs);
+  if (buf != NULL) memmove(io->buf + ofs, buf, len);
+  if (ofs > io->len) io->len += ofs - io->len;
+  io->len += len;
+  return len;
+}
+
+size_t mg_iobuf_del(struct mg_iobuf *io, size_t ofs, size_t len) {
+  if (ofs > io->len) ofs = io->len;
+  if (ofs + len > io->len) len = io->len - ofs;
+  memmove(io->buf + ofs, io->buf + ofs + len, io->len - ofs - len);
+  zeromem(io->buf + io->len - len, len);
+  io->len -= len;
+  return len;
+}
+
+void mg_iobuf_free(struct mg_iobuf *io) {
+  mg_iobuf_resize(io, 0);
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/log.c"
+#endif
+
+
+
+#if MG_ENABLE_LOG
+static void mg_log_stdout(const void *buf, size_t len, void *userdata) {
+  (void) userdata;
+#if MG_ENABLE_FILE
+  fwrite(buf, 1, len, stdout);
+#endif
+}
+
+static const char *s_spec = "2";
+static void (*s_fn)(const void *, size_t, void *) = mg_log_stdout;
+static void *s_fn_param = NULL;
+
+void mg_log_set(const char *spec) {
+  MG_DEBUG(("Setting log level to %s", spec));
+  s_spec = spec;
+}
+
+bool mg_log_prefix(int level, const char *file, int line, const char *fname) {
+  // static unsigned long seq;
+  int max = MG_LL_INFO;
+  struct mg_str k, v, s = mg_str(s_spec);
+  const char *p = strrchr(file, '/');
+
+  if (s_fn == NULL) return false;
+
+  if (p == NULL) p = strrchr(file, '\\');
+  p = p == NULL ? file : p + 1;
+
+  while (mg_commalist(&s, &k, &v)) {
+    if (v.len == 0) max = atoi(k.ptr);
+    if (v.len > 0 && strncmp(p, k.ptr, k.len) == 0) max = atoi(v.ptr);
+  }
+
+  if (level <= max) {
+    char buf[41];
+    size_t n = mg_snprintf(buf, sizeof(buf), "%llx %d %s:%d:%s", mg_millis(),
+                           level, p, line, fname);
+    if (n > sizeof(buf) - 2) n = sizeof(buf) - 2;
+    while (n < sizeof(buf)) buf[n++] = ' ';
+    buf[sizeof(buf) - 1] = '\0';
+    s_fn(buf, n - 1, s_fn_param);
+    return true;
+  } else {
+    return false;
+  }
+}
+
+void mg_log(const char *fmt, ...) {
+  char mem[256], *buf = mem;
+  va_list ap;
+  size_t len;
+  va_start(ap, fmt);
+  len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  va_end(ap);
+  s_fn(buf, len, s_fn_param);
+  s_fn("\n", 1, s_fn_param);
+  if (buf != mem) free(buf);
+}
+
+void mg_log_set_callback(void (*fn)(const void *, size_t, void *), void *fnd) {
+  s_fn = fn;
+  s_fn_param = fnd;
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/md5.c"
+#endif
+#include <string.h>
+
+
+#if defined(MG_ENABLE_MD5) && MG_ENABLE_MD5
+#if !defined(BYTE_ORDER) && defined(__BYTE_ORDER)
+#define BYTE_ORDER __BYTE_ORDER
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#endif /* LITTLE_ENDIAN */
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN __LITTLE_ENDIAN
+#endif /* BIG_ENDIAN */
+#endif /* BYTE_ORDER */
+
+static void mg_byte_reverse(unsigned char *buf, unsigned longs) {
+/* Forrest: MD5 expect LITTLE_ENDIAN, swap if BIG_ENDIAN */
+#if BYTE_ORDER == BIG_ENDIAN
+  do {
+    uint32_t t = (uint32_t)((unsigned) buf[3] << 8 | buf[2]) << 16 |
+                 ((unsigned) buf[1] << 8 | buf[0]);
+    *(uint32_t *) buf = t;
+    buf += 4;
+  } while (--longs);
+#else
+  (void) buf;
+  (void) longs;
+#endif
+}
+
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+#define MD5STEP(f, w, x, y, z, data, s) \
+  (w += f(x, y, z) + data, w = w << s | w >> (32 - s), w += x)
+
+/*
+ * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
+ * initialization constants.
+ */
+void mg_md5_init(mg_md5_ctx *ctx) {
+  ctx->buf[0] = 0x67452301;
+  ctx->buf[1] = 0xefcdab89;
+  ctx->buf[2] = 0x98badcfe;
+  ctx->buf[3] = 0x10325476;
+
+  ctx->bits[0] = 0;
+  ctx->bits[1] = 0;
+}
+
+static void mg_md5_transform(uint32_t buf[4], uint32_t const in[16]) {
+  uint32_t a, b, c, d;
+
+  a = buf[0];
+  b = buf[1];
+  c = buf[2];
+  d = buf[3];
+
+  MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+  MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+  MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+  MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+  MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+  MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+  MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+  MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+  MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+  MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+  MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+  MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+  MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+  MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+  MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+  MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+  MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+  MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+  MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+  MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+  MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+  MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+  MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+  MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+  MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+  MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+  MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+  MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+  MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+  MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+  MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+  MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+  MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+  MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+  MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+  MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+  MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+  MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+  MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+  MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+  MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+  MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+  MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+  MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+  MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+  MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+  MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+  MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+  MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+  MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+  MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+  MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+  MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+  MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+  MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+  MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+  MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+  MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+  MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+  MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+  MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+  MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+  MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+  MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+  buf[0] += a;
+  buf[1] += b;
+  buf[2] += c;
+  buf[3] += d;
+}
+
+void mg_md5_update(mg_md5_ctx *ctx, const unsigned char *buf, size_t len) {
+  uint32_t t;
+
+  t = ctx->bits[0];
+  if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t) ctx->bits[1]++;
+  ctx->bits[1] += (uint32_t) len >> 29;
+
+  t = (t >> 3) & 0x3f;
+
+  if (t) {
+    unsigned char *p = (unsigned char *) ctx->in + t;
+
+    t = 64 - t;
+    if (len < t) {
+      memcpy(p, buf, len);
+      return;
+    }
+    memcpy(p, buf, t);
+    mg_byte_reverse(ctx->in, 16);
+    mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += t;
+    len -= t;
+  }
+
+  while (len >= 64) {
+    memcpy(ctx->in, buf, 64);
+    mg_byte_reverse(ctx->in, 16);
+    mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+    buf += 64;
+    len -= 64;
+  }
+
+  memcpy(ctx->in, buf, len);
+}
+
+void mg_md5_final(mg_md5_ctx *ctx, unsigned char digest[16]) {
+  unsigned count;
+  unsigned char *p;
+  uint32_t *a;
+
+  count = (ctx->bits[0] >> 3) & 0x3F;
+
+  p = ctx->in + count;
+  *p++ = 0x80;
+  count = 64 - 1 - count;
+  if (count < 8) {
+    memset(p, 0, count);
+    mg_byte_reverse(ctx->in, 16);
+    mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+    memset(ctx->in, 0, 56);
+  } else {
+    memset(p, 0, count - 8);
+  }
+  mg_byte_reverse(ctx->in, 14);
+
+  a = (uint32_t *) ctx->in;
+  a[14] = ctx->bits[0];
+  a[15] = ctx->bits[1];
+
+  mg_md5_transform(ctx->buf, (uint32_t *) ctx->in);
+  mg_byte_reverse((unsigned char *) ctx->buf, 4);
+  memcpy(digest, ctx->buf, 16);
+  memset((char *) ctx, 0, sizeof(*ctx));
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/mqtt.c"
+#endif
+
+
+
+
+
+
+
+
+#define MQTT_CLEAN_SESSION 0x02
+#define MQTT_HAS_WILL 0x04
+#define MQTT_WILL_RETAIN 0x20
+#define MQTT_HAS_PASSWORD 0x40
+#define MQTT_HAS_USER_NAME 0x80
+
+enum { MQTT_OK, MQTT_INCOMPLETE, MQTT_MALFORMED };
+
+void mg_mqtt_send_header(struct mg_connection *c, uint8_t cmd, uint8_t flags,
+                         uint32_t len) {
+  uint8_t buf[1 + sizeof(len)], *vlen = &buf[1];
+  buf[0] = (uint8_t) ((cmd << 4) | flags);
+  do {
+    *vlen = len % 0x80;
+    len /= 0x80;
+    if (len > 0) *vlen |= 0x80;
+    vlen++;
+  } while (len > 0 && vlen < &buf[sizeof(buf)]);
+  mg_send(c, buf, (size_t) (vlen - buf));
+}
+
+static void mg_send_u16(struct mg_connection *c, uint16_t value) {
+  mg_send(c, &value, sizeof(value));
+}
+
+void mg_mqtt_login(struct mg_connection *c, struct mg_mqtt_opts *opts) {
+  char rnd[9], client_id[16];
+  struct mg_str cid = opts->client_id;
+  uint32_t total_len = 7 + 1 + 2 + 2;
+  uint8_t connflag = (uint8_t) ((opts->will_qos & 3) << 3);
+
+  if (cid.len == 0) {
+    mg_random(rnd, sizeof(rnd));
+    mg_base64_encode((unsigned char *) rnd, sizeof(rnd), client_id);
+    client_id[sizeof(client_id) - 1] = '\0';
+    cid = mg_str(client_id);
+  }
+
+  if (opts->user.len > 0) {
+    total_len += 2 + (uint32_t) opts->user.len;
+    connflag |= MQTT_HAS_USER_NAME;
+  }
+  if (opts->pass.len > 0) {
+    total_len += 2 + (uint32_t) opts->pass.len;
+    connflag |= MQTT_HAS_PASSWORD;
+  }
+  if (opts->will_topic.len > 0 && opts->will_message.len > 0) {
+    total_len +=
+        4 + (uint32_t) opts->will_topic.len + (uint32_t) opts->will_message.len;
+    connflag |= MQTT_HAS_WILL;
+  }
+  if (opts->clean || cid.len == 0) connflag |= MQTT_CLEAN_SESSION;
+  if (opts->will_retain) connflag |= MQTT_WILL_RETAIN;
+  total_len += (uint32_t) cid.len;
+
+  mg_mqtt_send_header(c, MQTT_CMD_CONNECT, 0, total_len);
+  mg_send(c, "\00\04MQTT\04", 7);
+  mg_send(c, &connflag, sizeof(connflag));
+  // keepalive == 0 means "do not disconnect us!"
+  mg_send_u16(c, mg_htons((uint16_t) opts->keepalive));
+  mg_send_u16(c, mg_htons((uint16_t) cid.len));
+  mg_send(c, cid.ptr, cid.len);
+  if (connflag & MQTT_HAS_WILL) {
+    mg_send_u16(c, mg_htons((uint16_t) opts->will_topic.len));
+    mg_send(c, opts->will_topic.ptr, opts->will_topic.len);
+    mg_send_u16(c, mg_htons((uint16_t) opts->will_message.len));
+    mg_send(c, opts->will_message.ptr, opts->will_message.len);
+  }
+  if (opts->user.len > 0) {
+    mg_send_u16(c, mg_htons((uint16_t) opts->user.len));
+    mg_send(c, opts->user.ptr, opts->user.len);
+  }
+  if (opts->pass.len > 0) {
+    mg_send_u16(c, mg_htons((uint16_t) opts->pass.len));
+    mg_send(c, opts->pass.ptr, opts->pass.len);
+  }
+}
+
+void mg_mqtt_pub(struct mg_connection *c, struct mg_str topic,
+                 struct mg_str data, int qos, bool retain) {
+  uint8_t flags = (uint8_t) (((qos & 3) << 1) | (retain ? 1 : 0));
+  uint32_t total_len = 2 + (uint32_t) topic.len + (uint32_t) data.len;
+  MG_DEBUG(("%lu [%.*s] -> [%.*s]", c->id, (int) topic.len, (char *) topic.ptr,
+            (int) data.len, (char *) data.ptr));
+  if (qos > 0) total_len += 2;
+  mg_mqtt_send_header(c, MQTT_CMD_PUBLISH, flags, total_len);
+  mg_send_u16(c, mg_htons((uint16_t) topic.len));
+  mg_send(c, topic.ptr, topic.len);
+  if (qos > 0) {
+    static uint16_t s_id;
+    if (++s_id == 0) s_id++;
+    mg_send_u16(c, mg_htons(s_id));
+  }
+  mg_send(c, data.ptr, data.len);
+}
+
+void mg_mqtt_sub(struct mg_connection *c, struct mg_str topic, int qos) {
+  static uint16_t s_id;
+  uint8_t qos_ = qos & 3;
+  uint32_t total_len = 2 + (uint32_t) topic.len + 2 + 1;
+  mg_mqtt_send_header(c, MQTT_CMD_SUBSCRIBE, 2, total_len);
+  if (++s_id == 0) ++s_id;
+  mg_send_u16(c, mg_htons(s_id));
+  mg_send_u16(c, mg_htons((uint16_t) topic.len));
+  mg_send(c, topic.ptr, topic.len);
+  mg_send(c, &qos_, sizeof(qos_));
+}
+
+int mg_mqtt_parse(const uint8_t *buf, size_t len, struct mg_mqtt_message *m) {
+  uint8_t lc = 0, *p, *end;
+  uint32_t n = 0, len_len = 0;
+
+  memset(m, 0, sizeof(*m));
+  m->dgram.ptr = (char *) buf;
+  if (len < 2) return MQTT_INCOMPLETE;
+  m->cmd = (uint8_t) (buf[0] >> 4);
+  m->qos = (buf[0] >> 1) & 3;
+
+  n = len_len = 0;
+  p = (uint8_t *) buf + 1;
+  while ((size_t) (p - buf) < len) {
+    lc = *((uint8_t *) p++);
+    n += (uint32_t) ((lc & 0x7f) << 7 * len_len);
+    len_len++;
+    if (!(lc & 0x80)) break;
+    if (len_len >= 4) return MQTT_MALFORMED;
+  }
+  end = p + n;
+  if ((lc & 0x80) || (end > buf + len)) return MQTT_INCOMPLETE;
+  m->dgram.len = (size_t) (end - buf);
+
+  switch (m->cmd) {
+    case MQTT_CMD_CONNACK:
+      if (end - p < 2) return MQTT_MALFORMED;
+      m->ack = p[1];
+      break;
+    case MQTT_CMD_PUBACK:
+    case MQTT_CMD_PUBREC:
+    case MQTT_CMD_PUBREL:
+    case MQTT_CMD_PUBCOMP:
+    case MQTT_CMD_SUBACK:
+      if (p + 2 > end) return MQTT_MALFORMED;
+      m->id = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
+      break;
+    case MQTT_CMD_SUBSCRIBE: {
+      if (p + 2 > end) return MQTT_MALFORMED;
+      m->id = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
+      p += 2;
+      break;
+    }
+    case MQTT_CMD_PUBLISH: {
+      if (p + 2 > end) return MQTT_MALFORMED;
+      m->topic.len = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
+      m->topic.ptr = (char *) p + 2;
+      p += 2 + m->topic.len;
+      if (p > end) return MQTT_MALFORMED;
+      if (m->qos > 0) {
+        if (p + 2 > end) return MQTT_MALFORMED;
+        m->id = (uint16_t) ((((uint16_t) p[0]) << 8) | p[1]);
+        p += 2;
+      }
+      if (p > end) return MQTT_MALFORMED;
+      m->data.ptr = (char *) p;
+      m->data.len = (size_t) (end - p);
+      break;
+    }
+    default:
+      break;
+  }
+  return MQTT_OK;
+}
+
+static size_t mg_mqtt_next_topic(struct mg_mqtt_message *msg,
+                                 struct mg_str *topic, uint8_t *qos,
+                                 size_t pos) {
+  unsigned char *buf = (unsigned char *) msg->dgram.ptr + pos;
+  size_t new_pos;
+  if (pos >= msg->dgram.len) return 0;
+
+  topic->len = (size_t) (((unsigned) buf[0]) << 8 | buf[1]);
+  topic->ptr = (char *) buf + 2;
+  new_pos = pos + 2 + topic->len + (qos == NULL ? 0 : 1);
+  if ((size_t) new_pos > msg->dgram.len) return 0;
+  if (qos != NULL) *qos = buf[2 + topic->len];
+  return new_pos;
+}
+
+size_t mg_mqtt_next_sub(struct mg_mqtt_message *msg, struct mg_str *topic,
+                        uint8_t *qos, size_t pos) {
+  uint8_t tmp;
+  return mg_mqtt_next_topic(msg, topic, qos == NULL ? &tmp : qos, pos);
+}
+
+size_t mg_mqtt_next_unsub(struct mg_mqtt_message *msg, struct mg_str *topic,
+                          size_t pos) {
+  return mg_mqtt_next_topic(msg, topic, NULL, pos);
+}
+
+static void mqtt_cb(struct mg_connection *c, int ev, void *ev_data,
+                    void *fn_data) {
+  if (ev == MG_EV_READ) {
+    for (;;) {
+      struct mg_mqtt_message mm;
+      int rc = mg_mqtt_parse(c->recv.buf, c->recv.len, &mm);
+      if (rc == MQTT_MALFORMED) {
+        MG_ERROR(("%lu MQTT malformed message", c->id));
+        c->is_closing = 1;
+        break;
+      } else if (rc == MQTT_OK) {
+        MG_VERBOSE(("%p MQTT CMD %d len %d [%.*s]", c->fd, mm.cmd,
+                    (int) mm.dgram.len, (int) mm.data.len, mm.data.ptr));
+        switch (mm.cmd) {
+          case MQTT_CMD_CONNACK:
+            mg_call(c, MG_EV_MQTT_OPEN, &mm.ack);
+            if (mm.ack == 0) {
+              MG_DEBUG(("%lu Connected", c->id));
+            } else {
+              MG_ERROR(("%lu MQTT auth failed, code %d", c->id, mm.ack));
+              c->is_closing = 1;
+            }
+            break;
+          case MQTT_CMD_PUBLISH: {
+            MG_DEBUG(("%lu [%.*s] -> [%.*s]", c->id, (int) mm.topic.len,
+                      mm.topic.ptr, (int) mm.data.len, mm.data.ptr));
+            mg_call(c, MG_EV_MQTT_MSG, &mm);
+            break;
+          }
+        }
+        mg_call(c, MG_EV_MQTT_CMD, &mm);
+        mg_iobuf_del(&c->recv, 0, mm.dgram.len);
+      } else {
+        break;
+      }
+    }
+  }
+  (void) ev_data;
+  (void) fn_data;
+}
+
+void mg_mqtt_ping(struct mg_connection *nc) {
+  mg_mqtt_send_header(nc, MQTT_CMD_PINGREQ, 0, 0);
+}
+
+void mg_mqtt_pong(struct mg_connection *nc) {
+  mg_mqtt_send_header(nc, MQTT_CMD_PINGRESP, 0, 0);
+}
+
+void mg_mqtt_disconnect(struct mg_connection *nc) {
+  mg_mqtt_send_header(nc, MQTT_CMD_DISCONNECT, 0, 0);
+}
+
+struct mg_connection *mg_mqtt_connect(struct mg_mgr *mgr, const char *url,
+                                      struct mg_mqtt_opts *opts,
+                                      mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_connect(mgr, url, fn, fn_data);
+  if (c != NULL) {
+    struct mg_mqtt_opts empty;
+    memset(&empty, 0, sizeof(empty));
+    mg_mqtt_login(c, opts == NULL ? &empty : opts);
+    c->pfn = mqtt_cb;
+  }
+  return c;
+}
+
+struct mg_connection *mg_mqtt_listen(struct mg_mgr *mgr, const char *url,
+                                     mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = mg_listen(mgr, url, fn, fn_data);
+  if (c != NULL) c->pfn = mqtt_cb, c->pfn_data = mgr;
+  return c;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/net.c"
+#endif
+
+
+
+
+size_t mg_vprintf(struct mg_connection *c, const char *fmt, va_list ap) {
+  char mem[256], *buf = mem;
+  size_t len = mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  len = mg_send(c, buf, len);
+  if (buf != mem) free(buf);
+  return len;
+}
+
+size_t mg_printf(struct mg_connection *c, const char *fmt, ...) {
+  size_t len = 0;
+  va_list ap;
+  va_start(ap, fmt);
+  len = mg_vprintf(c, fmt, ap);
+  va_end(ap);
+  return len;
+}
+
+char *mg_straddr(struct mg_addr *a, char *buf, size_t len) {
+  char tmp[30];
+  const char *fmt = a->is_ip6 ? "[%s]:%d" : "%s:%d";
+  mg_ntoa(a, tmp, sizeof(tmp));
+  mg_snprintf(buf, len, fmt, tmp, (int) mg_ntohs(a->port));
+  return buf;
+}
+
+char *mg_ntoa(const struct mg_addr *addr, char *buf, size_t len) {
+  if (addr->is_ip6) {
+    uint16_t *p = (uint16_t *) addr->ip6;
+    mg_snprintf(buf, len, "%x:%x:%x:%x:%x:%x:%x:%x", mg_htons(p[0]),
+                mg_htons(p[1]), mg_htons(p[2]), mg_htons(p[3]), mg_htons(p[4]),
+                mg_htons(p[5]), mg_htons(p[6]), mg_htons(p[7]));
+  } else {
+    uint8_t p[4];
+    memcpy(p, &addr->ip, sizeof(p));
+    mg_snprintf(buf, len, "%d.%d.%d.%d", (int) p[0], (int) p[1], (int) p[2],
+                (int) p[3]);
+  }
+  return buf;
+}
+
+static bool mg_atonl(struct mg_str str, struct mg_addr *addr) {
+  if (mg_vcasecmp(&str, "localhost") != 0) return false;
+  addr->ip = mg_htonl(0x7f000001);
+  addr->is_ip6 = false;
+  return true;
+}
+
+static bool mg_atone(struct mg_str str, struct mg_addr *addr) {
+  if (str.len > 0) return false;
+  addr->ip = 0;
+  addr->is_ip6 = false;
+  return true;
+}
+
+static bool mg_aton4(struct mg_str str, struct mg_addr *addr) {
+  uint8_t data[4] = {0, 0, 0, 0};
+  size_t i, num_dots = 0;
+  for (i = 0; i < str.len; i++) {
+    if (str.ptr[i] >= '0' && str.ptr[i] <= '9') {
+      int octet = data[num_dots] * 10 + (str.ptr[i] - '0');
+      if (octet > 255) return false;
+      data[num_dots] = (uint8_t) octet;
+    } else if (str.ptr[i] == '.') {
+      if (num_dots >= 3 || i == 0 || str.ptr[i - 1] == '.') return false;
+      num_dots++;
+    } else {
+      return false;
+    }
+  }
+  if (num_dots != 3 || str.ptr[i - 1] == '.') return false;
+  memcpy(&addr->ip, data, sizeof(data));
+  addr->is_ip6 = false;
+  return true;
+}
+
+static bool mg_v4mapped(struct mg_str str, struct mg_addr *addr) {
+  int i;
+  if (str.len < 14) return false;
+  if (str.ptr[0] != ':' || str.ptr[1] != ':' || str.ptr[6] != ':') return false;
+  for (i = 2; i < 6; i++) {
+    if (str.ptr[i] != 'f' && str.ptr[i] != 'F') return false;
+  }
+  if (!mg_aton4(mg_str_n(&str.ptr[7], str.len - 7), addr)) return false;
+  memset(addr->ip6, 0, sizeof(addr->ip6));
+  addr->ip6[10] = addr->ip6[11] = 255;
+  memcpy(&addr->ip6[12], &addr->ip, 4);
+  addr->is_ip6 = true;
+  return true;
+}
+
+static bool mg_aton6(struct mg_str str, struct mg_addr *addr) {
+  size_t i, j = 0, n = 0, dc = 42;
+  if (str.len > 2 && str.ptr[0] == '[') str.ptr++, str.len -= 2;
+  if (mg_v4mapped(str, addr)) return true;
+  for (i = 0; i < str.len; i++) {
+    if ((str.ptr[i] >= '0' && str.ptr[i] <= '9') ||
+        (str.ptr[i] >= 'a' && str.ptr[i] <= 'f') ||
+        (str.ptr[i] >= 'A' && str.ptr[i] <= 'F')) {
+      unsigned long val;
+      if (i > j + 3) return false;
+      // MG_DEBUG(("%zu %zu [%.*s]", i, j, (int) (i - j + 1), &str.ptr[j]));
+      val = mg_unhexn(&str.ptr[j], i - j + 1);
+      addr->ip6[n] = (uint8_t) ((val >> 8) & 255);
+      addr->ip6[n + 1] = (uint8_t) (val & 255);
+    } else if (str.ptr[i] == ':') {
+      j = i + 1;
+      if (i > 0 && str.ptr[i - 1] == ':') {
+        dc = n;  // Double colon
+        if (i > 1 && str.ptr[i - 2] == ':') return false;
+      } else if (i > 0) {
+        n += 2;
+      }
+      if (n > 14) return false;
+      addr->ip6[n] = addr->ip6[n + 1] = 0;  // For trailing ::
+    } else {
+      return false;
+    }
+  }
+  if (n < 14 && dc == 42) return false;
+  if (n < 14) {
+    memmove(&addr->ip6[dc + (14 - n)], &addr->ip6[dc], n - dc + 2);
+    memset(&addr->ip6[dc], 0, 14 - n);
+  }
+  addr->is_ip6 = true;
+  return true;
+}
+
+bool mg_aton(struct mg_str str, struct mg_addr *addr) {
+  // MG_INFO(("[%.*s]", (int) str.len, str.ptr));
+  return mg_atone(str, addr) || mg_atonl(str, addr) || mg_aton4(str, addr) ||
+         mg_aton6(str, addr);
+}
+
+void mg_mgr_free(struct mg_mgr *mgr) {
+  struct mg_connection *c;
+  for (c = mgr->conns; c != NULL; c = c->next) c->is_closing = 1;
+  mg_mgr_poll(mgr, 0);
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+  FreeRTOS_DeleteSocketSet(mgr->ss);
+#endif
+  MG_DEBUG(("All connections closed"));
+}
+
+void mg_mgr_init(struct mg_mgr *mgr) {
+  memset(mgr, 0, sizeof(*mgr));
+#if MG_ARCH == MG_ARCH_WIN32 && MG_ENABLE_WINSOCK
+  // clang-format off
+  { WSADATA data; WSAStartup(MAKEWORD(2, 2), &data); }
+  // clang-format on
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+  mgr->ss = FreeRTOS_CreateSocketSet();
+#elif defined(__unix) || defined(__unix__) || defined(__APPLE__)
+  // Ignore SIGPIPE signal, so if client cancels the request, it
+  // won't kill the whole process.
+  signal(SIGPIPE, SIG_IGN);
+#endif
+  mgr->dnstimeout = 3000;
+  mgr->dns4.url = "udp://8.8.8.8:53";
+  mgr->dns6.url = "udp://[2001:4860:4860::8888]:53";
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/sha1.c"
+#endif
+/* Copyright(c) By Steve Reid <steve@edmweb.com> */
+/* 100% Public Domain */
+
+#include <string.h>
+
+/*
+ * clang with std=-c99 uses __LITTLE_ENDIAN, by default
+ * while for ex, RTOS gcc - LITTLE_ENDIAN, by default
+ * it depends on __USE_BSD, but let's have everything
+ */
+#if !defined(BYTE_ORDER) && defined(__BYTE_ORDER)
+#define BYTE_ORDER __BYTE_ORDER
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN __LITTLE_ENDIAN
+#endif /* LITTLE_ENDIAN */
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN __LITTLE_ENDIAN
+#endif /* BIG_ENDIAN */
+#endif /* BYTE_ORDER */
+
+union char64long16 {
+  unsigned char c[64];
+  uint32_t l[16];
+};
+
+#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
+
+static uint32_t blk0(union char64long16 *block, int i) {
+/* Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN */
+#if BYTE_ORDER == LITTLE_ENDIAN
+  block->l[i] =
+      (rol(block->l[i], 24) & 0xFF00FF00) | (rol(block->l[i], 8) & 0x00FF00FF);
+#endif
+  return block->l[i];
+}
+
+/* Avoid redefine warning (ARM /usr/include/sys/ucontext.h define R0~R4) */
+#undef blk
+#undef R0
+#undef R1
+#undef R2
+#undef R3
+#undef R4
+
+#define blk(i)                                                               \
+  (block->l[i & 15] = rol(block->l[(i + 13) & 15] ^ block->l[(i + 8) & 15] ^ \
+                              block->l[(i + 2) & 15] ^ block->l[i & 15],     \
+                          1))
+#define R0(v, w, x, y, z, i)                                          \
+  z += ((w & (x ^ y)) ^ y) + blk0(block, i) + 0x5A827999 + rol(v, 5); \
+  w = rol(w, 30);
+#define R1(v, w, x, y, z, i)                                  \
+  z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
+  w = rol(w, 30);
+#define R2(v, w, x, y, z, i)                          \
+  z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
+  w = rol(w, 30);
+#define R3(v, w, x, y, z, i)                                        \
+  z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
+  w = rol(w, 30);
+#define R4(v, w, x, y, z, i)                          \
+  z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
+  w = rol(w, 30);
+
+static void mg_sha1_transform(uint32_t state[5], const unsigned char buffer[64]) {
+  uint32_t a, b, c, d, e;
+  union char64long16 block[1];
+
+  memcpy(block, buffer, 64);
+  a = state[0];
+  b = state[1];
+  c = state[2];
+  d = state[3];
+  e = state[4];
+  R0(a, b, c, d, e, 0);
+  R0(e, a, b, c, d, 1);
+  R0(d, e, a, b, c, 2);
+  R0(c, d, e, a, b, 3);
+  R0(b, c, d, e, a, 4);
+  R0(a, b, c, d, e, 5);
+  R0(e, a, b, c, d, 6);
+  R0(d, e, a, b, c, 7);
+  R0(c, d, e, a, b, 8);
+  R0(b, c, d, e, a, 9);
+  R0(a, b, c, d, e, 10);
+  R0(e, a, b, c, d, 11);
+  R0(d, e, a, b, c, 12);
+  R0(c, d, e, a, b, 13);
+  R0(b, c, d, e, a, 14);
+  R0(a, b, c, d, e, 15);
+  R1(e, a, b, c, d, 16);
+  R1(d, e, a, b, c, 17);
+  R1(c, d, e, a, b, 18);
+  R1(b, c, d, e, a, 19);
+  R2(a, b, c, d, e, 20);
+  R2(e, a, b, c, d, 21);
+  R2(d, e, a, b, c, 22);
+  R2(c, d, e, a, b, 23);
+  R2(b, c, d, e, a, 24);
+  R2(a, b, c, d, e, 25);
+  R2(e, a, b, c, d, 26);
+  R2(d, e, a, b, c, 27);
+  R2(c, d, e, a, b, 28);
+  R2(b, c, d, e, a, 29);
+  R2(a, b, c, d, e, 30);
+  R2(e, a, b, c, d, 31);
+  R2(d, e, a, b, c, 32);
+  R2(c, d, e, a, b, 33);
+  R2(b, c, d, e, a, 34);
+  R2(a, b, c, d, e, 35);
+  R2(e, a, b, c, d, 36);
+  R2(d, e, a, b, c, 37);
+  R2(c, d, e, a, b, 38);
+  R2(b, c, d, e, a, 39);
+  R3(a, b, c, d, e, 40);
+  R3(e, a, b, c, d, 41);
+  R3(d, e, a, b, c, 42);
+  R3(c, d, e, a, b, 43);
+  R3(b, c, d, e, a, 44);
+  R3(a, b, c, d, e, 45);
+  R3(e, a, b, c, d, 46);
+  R3(d, e, a, b, c, 47);
+  R3(c, d, e, a, b, 48);
+  R3(b, c, d, e, a, 49);
+  R3(a, b, c, d, e, 50);
+  R3(e, a, b, c, d, 51);
+  R3(d, e, a, b, c, 52);
+  R3(c, d, e, a, b, 53);
+  R3(b, c, d, e, a, 54);
+  R3(a, b, c, d, e, 55);
+  R3(e, a, b, c, d, 56);
+  R3(d, e, a, b, c, 57);
+  R3(c, d, e, a, b, 58);
+  R3(b, c, d, e, a, 59);
+  R4(a, b, c, d, e, 60);
+  R4(e, a, b, c, d, 61);
+  R4(d, e, a, b, c, 62);
+  R4(c, d, e, a, b, 63);
+  R4(b, c, d, e, a, 64);
+  R4(a, b, c, d, e, 65);
+  R4(e, a, b, c, d, 66);
+  R4(d, e, a, b, c, 67);
+  R4(c, d, e, a, b, 68);
+  R4(b, c, d, e, a, 69);
+  R4(a, b, c, d, e, 70);
+  R4(e, a, b, c, d, 71);
+  R4(d, e, a, b, c, 72);
+  R4(c, d, e, a, b, 73);
+  R4(b, c, d, e, a, 74);
+  R4(a, b, c, d, e, 75);
+  R4(e, a, b, c, d, 76);
+  R4(d, e, a, b, c, 77);
+  R4(c, d, e, a, b, 78);
+  R4(b, c, d, e, a, 79);
+  state[0] += a;
+  state[1] += b;
+  state[2] += c;
+  state[3] += d;
+  state[4] += e;
+  /* Erase working structures. The order of operations is important,
+   * used to ensure that compiler doesn't optimize those out. */
+  memset(block, 0, sizeof(block));
+  a = b = c = d = e = 0;
+  (void) a;
+  (void) b;
+  (void) c;
+  (void) d;
+  (void) e;
+}
+
+void mg_sha1_init(mg_sha1_ctx *context) {
+  context->state[0] = 0x67452301;
+  context->state[1] = 0xEFCDAB89;
+  context->state[2] = 0x98BADCFE;
+  context->state[3] = 0x10325476;
+  context->state[4] = 0xC3D2E1F0;
+  context->count[0] = context->count[1] = 0;
+}
+
+void mg_sha1_update(mg_sha1_ctx *context, const unsigned char *data,
+                    size_t len) {
+  size_t i, j;
+
+  j = context->count[0];
+  if ((context->count[0] += (uint32_t) len << 3) < j) context->count[1]++;
+  context->count[1] += (uint32_t)(len >> 29);
+  j = (j >> 3) & 63;
+  if ((j + len) > 63) {
+    memcpy(&context->buffer[j], data, (i = 64 - j));
+    mg_sha1_transform(context->state, context->buffer);
+    for (; i + 63 < len; i += 64) {
+      mg_sha1_transform(context->state, &data[i]);
+    }
+    j = 0;
+  } else
+    i = 0;
+  memcpy(&context->buffer[j], &data[i], len - i);
+}
+
+void mg_sha1_final(unsigned char digest[20], mg_sha1_ctx *context) {
+  unsigned i;
+  unsigned char finalcount[8], c;
+
+  for (i = 0; i < 8; i++) {
+    finalcount[i] = (unsigned char) ((context->count[(i >= 4 ? 0 : 1)] >>
+                                      ((3 - (i & 3)) * 8)) &
+                                     255);
+  }
+  c = 0200;
+  mg_sha1_update(context, &c, 1);
+  while ((context->count[0] & 504) != 448) {
+    c = 0000;
+    mg_sha1_update(context, &c, 1);
+  }
+  mg_sha1_update(context, finalcount, 8);
+  for (i = 0; i < 20; i++) {
+    digest[i] =
+        (unsigned char) ((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
+  }
+  memset(context, '\0', sizeof(*context));
+  memset(&finalcount, '\0', sizeof(finalcount));
+}
+
+void mg_hmac_sha1(const unsigned char *key, size_t keylen,
+                  const unsigned char *data, size_t datalen,
+                  unsigned char out[20]) {
+  mg_sha1_ctx ctx;
+  unsigned char buf1[64], buf2[64], tmp_key[20], i;
+
+  if (keylen > sizeof(buf1)) {
+    mg_sha1_init(&ctx);
+    mg_sha1_update(&ctx, key, keylen);
+    mg_sha1_final(tmp_key, &ctx);
+    key = tmp_key;
+    keylen = sizeof(tmp_key);
+  }
+
+  memset(buf1, 0, sizeof(buf1));
+  memset(buf2, 0, sizeof(buf2));
+  memcpy(buf1, key, keylen);
+  memcpy(buf2, key, keylen);
+
+  for (i = 0; i < sizeof(buf1); i++) {
+    buf1[i] ^= 0x36;
+    buf2[i] ^= 0x5c;
+  }
+
+  mg_sha1_init(&ctx);
+  mg_sha1_update(&ctx, buf1, sizeof(buf1));
+  mg_sha1_update(&ctx, data, datalen);
+  mg_sha1_final(out, &ctx);
+
+  mg_sha1_init(&ctx);
+  mg_sha1_update(&ctx, buf2, sizeof(buf2));
+  mg_sha1_update(&ctx, out, 20);
+  mg_sha1_final(out, &ctx);
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/sntp.c"
+#endif
+
+
+
+
+
+
+#define SNTP_INTERVAL_SEC 3600
+#define SNTP_TIME_OFFSET 2208988800UL
+
+static unsigned long s_sntmp_next;
+
+int64_t mg_sntp_parse(const unsigned char *buf, size_t len) {
+  int64_t res = -1;
+  int mode = len > 0 ? buf[0] & 7 : 0;
+  if (len < 48) {
+    MG_ERROR(("%s", "corrupt packet"));
+  } else if ((buf[0] & 0x38) >> 3 != 4) {
+    MG_ERROR(("%s", "wrong version"));
+  } else if (mode != 4 && mode != 5) {
+    MG_ERROR(("%s", "not a server reply"));
+  } else if (buf[1] == 0) {
+    MG_ERROR(("%s", "server sent a kiss of death"));
+  } else {
+    uint32_t *data = (uint32_t *) &buf[40];
+    unsigned long seconds = mg_ntohl(data[0]) - SNTP_TIME_OFFSET;
+    unsigned long useconds = mg_ntohl(data[1]);
+    // MG_DEBUG(("%lu %lu %lu", time(0), seconds, useconds));
+    res = ((int64_t) seconds) * 1000 + (int64_t) ((useconds / 1000) % 1000);
+    s_sntmp_next = seconds + SNTP_INTERVAL_SEC;
+  }
+  return res;
+}
+
+static void sntp_cb(struct mg_connection *c, int ev, void *evd, void *fnd) {
+  if (ev == MG_EV_READ) {
+    int64_t milliseconds = mg_sntp_parse(c->recv.buf, c->recv.len);
+    if (milliseconds > 0) {
+      mg_call(c, MG_EV_SNTP_TIME, &milliseconds);
+      MG_DEBUG(("%u.%u, next at %lu", (unsigned) (milliseconds / 1000),
+                (unsigned) (milliseconds % 1000), s_sntmp_next));
+    }
+    c->recv.len = 0;  // Clear receive buffer
+  } else if (ev == MG_EV_CONNECT) {
+    mg_sntp_send(c, (unsigned long) time(NULL));
+  } else if (ev == MG_EV_CLOSE) {
+  }
+  (void) fnd;
+  (void) evd;
+}
+
+void mg_sntp_send(struct mg_connection *c, unsigned long utc) {
+  if (c->is_resolving) {
+    MG_ERROR(("%lu wait until resolved", c->id));
+  } else if (utc > s_sntmp_next) {
+    uint8_t buf[48] = {0};
+    s_sntmp_next = utc + SNTP_INTERVAL_SEC;
+    buf[0] = (0 << 6) | (4 << 3) | 3;
+    mg_send(c, buf, sizeof(buf));
+    MG_DEBUG(("%lu ct %lu, next at %lu", c->id, utc, s_sntmp_next));
+  }
+}
+
+struct mg_connection *mg_sntp_connect(struct mg_mgr *mgr, const char *url,
+                                      mg_event_handler_t fn, void *fnd) {
+  struct mg_connection *c = NULL;
+  if (url == NULL) url = "udp://time.google.com:123";
+  if ((c = mg_connect(mgr, url, fn, fnd)) != NULL) c->pfn = sntp_cb;
+  return c;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/sock.c"
+#endif
+
+
+
+
+
+
+
+
+
+
+#if MG_ENABLE_SOCKET
+#if MG_ARCH == MG_ARCH_WIN32 && MG_ENABLE_WINSOCK
+#define MG_SOCK_ERRNO WSAGetLastError()
+#ifndef SO_EXCLUSIVEADDRUSE
+#define SO_EXCLUSIVEADDRUSE ((int) (~SO_REUSEADDR))
+#endif
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+#define MG_SOCK_ERRNO errno
+typedef Socket_t SOCKET;
+#define INVALID_SOCKET FREERTOS_INVALID_SOCKET
+#else
+#define MG_SOCK_ERRNO errno
+#ifndef closesocket
+#define closesocket(x) close(x)
+#endif
+#define INVALID_SOCKET (-1)
+typedef int SOCKET;
+#endif
+
+#define FD(c_) ((SOCKET) (size_t) (c_)->fd)
+#define S2PTR(s_) ((void *) (size_t) (s_))
+
+#ifndef MSG_NONBLOCKING
+#define MSG_NONBLOCKING 0
+#endif
+
+#ifndef AF_INET6
+#define AF_INET6 10
+#endif
+
+union usa {
+  struct sockaddr sa;
+  struct sockaddr_in sin;
+#if MG_ENABLE_IPV6
+  struct sockaddr_in6 sin6;
+#endif
+};
+
+static socklen_t tousa(struct mg_addr *a, union usa *usa) {
+  socklen_t len = sizeof(usa->sin);
+  memset(usa, 0, sizeof(*usa));
+  usa->sin.sin_family = AF_INET;
+  usa->sin.sin_port = a->port;
+  *(uint32_t *) &usa->sin.sin_addr = a->ip;
+#if MG_ENABLE_IPV6
+  if (a->is_ip6) {
+    usa->sin.sin_family = AF_INET6;
+    usa->sin6.sin6_port = a->port;
+    memcpy(&usa->sin6.sin6_addr, a->ip6, sizeof(a->ip6));
+    len = sizeof(usa->sin6);
+  }
+#endif
+  return len;
+}
+
+static void tomgaddr(union usa *usa, struct mg_addr *a, bool is_ip6) {
+  a->is_ip6 = is_ip6;
+  a->port = usa->sin.sin_port;
+  memcpy(&a->ip, &usa->sin.sin_addr, sizeof(a->ip));
+#if MG_ENABLE_IPV6
+  if (is_ip6) {
+    memcpy(a->ip6, &usa->sin6.sin6_addr, sizeof(a->ip6));
+    a->port = usa->sin6.sin6_port;
+  }
+#endif
+}
+
+static bool mg_sock_would_block(void) {
+  int err = MG_SOCK_ERRNO;
+  return err == EINPROGRESS || err == EWOULDBLOCK
+#ifndef WINCE
+         || err == EAGAIN || err == EINTR
+#endif
+#if MG_ARCH == MG_ARCH_WIN32 && MG_ENABLE_WINSOCK
+         || err == WSAEINTR || err == WSAEWOULDBLOCK
+#endif
+      ;
+}
+
+static struct mg_connection *alloc_conn(struct mg_mgr *mgr, bool is_client,
+                                        SOCKET fd) {
+  struct mg_connection *c = (struct mg_connection *) calloc(1, sizeof(*c));
+  if (c != NULL) {
+    c->is_client = is_client;
+    c->fd = S2PTR(fd);
+    c->mgr = mgr;
+    c->id = ++mgr->nextid;
+  }
+  return c;
+}
+
+static void iolog(struct mg_connection *c, char *buf, long n, bool r) {
+  int log_level = n > 0 ? MG_LL_VERBOSE : MG_LL_DEBUG;
+  char flags[] = {(char) ('0' + c->is_listening),
+                  (char) ('0' + c->is_client),
+                  (char) ('0' + c->is_accepted),
+                  (char) ('0' + c->is_resolving),
+                  (char) ('0' + c->is_connecting),
+                  (char) ('0' + c->is_tls),
+                  (char) ('0' + c->is_tls_hs),
+                  (char) ('0' + c->is_udp),
+                  (char) ('0' + c->is_websocket),
+                  (char) ('0' + c->is_hexdumping),
+                  (char) ('0' + c->is_draining),
+                  (char) ('0' + c->is_closing),
+                  (char) ('0' + c->is_readable),
+                  (char) ('0' + c->is_writable),
+                  '\0'};
+  MG_LOG(log_level,
+         ("%3lu %s %d:%d %ld err %d (%s)", c->id, flags, (int) c->send.len,
+          (int) c->recv.len, n, MG_SOCK_ERRNO, strerror(errno)));
+  if (n == 0) {
+    // Do nothing
+  } else if (n < 0) {
+    c->is_closing = 1;  // Error, or normal termination
+  } else if (n > 0) {
+    if (c->is_hexdumping) {
+      union usa usa;
+      char t1[50] = "", t2[50] = "";
+      socklen_t slen = sizeof(usa.sin);
+      char *s = mg_hexdump(buf, (size_t) n);
+      struct mg_addr a;
+      memset(&usa, 0, sizeof(usa));
+      memset(&a, 0, sizeof(a));
+      getsockname(FD(c), &usa.sa, &slen);
+      tomgaddr(&usa, &a, c->peer.is_ip6);
+      MG_INFO(("\n-- %lu %s %s %s %s %ld\n%s", c->id,
+               mg_straddr(&a, t1, sizeof(t1)), r ? "<-" : "->",
+               mg_straddr(&c->peer, t2, sizeof(t2)), c->label, n, s));
+      free(s);
+      (void) t1, (void) t2;  // Silence warnings for MG_ENABLE_LOG=0
+    }
+    if (r) {
+      struct mg_str evd = mg_str_n(buf, (size_t) n);
+      c->recv.len += (size_t) n;
+      mg_call(c, MG_EV_READ, &evd);
+    } else {
+      mg_iobuf_del(&c->send, 0, (size_t) n);
+      // if (c->send.len == 0) mg_iobuf_resize(&c->send, 0);
+      mg_call(c, MG_EV_WRITE, &n);
+    }
+  }
+}
+
+static long mg_sock_send(struct mg_connection *c, const void *buf, size_t len) {
+  long n;
+  if (c->is_udp) {
+    union usa usa;
+    socklen_t slen = tousa(&c->peer, &usa);
+    n = sendto(FD(c), (char *) buf, len, 0, &usa.sa, slen);
+  } else {
+    n = send(FD(c), (char *) buf, len, MSG_NONBLOCKING);
+  }
+  return n == 0 ? -1 : n < 0 && mg_sock_would_block() ? 0 : n;
+}
+
+bool mg_send(struct mg_connection *c, const void *buf, size_t len) {
+  if (c->is_udp) {
+    long n = mg_sock_send(c, buf, len);
+    iolog(c, (char *) buf, n, false);
+    return n > 0;
+  } else {
+    return mg_iobuf_add(&c->send, c->send.len, buf, len, MG_IO_SIZE);
+  }
+}
+
+static void mg_set_non_blocking_mode(SOCKET fd) {
+#if MG_ARCH == MG_ARCH_WIN32 && MG_ENABLE_WINSOCK
+  unsigned long on = 1;
+  ioctlsocket(fd, FIONBIO, &on);
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP
+  const BaseType_t off = 0;
+  setsockopt(fd, 0, FREERTOS_SO_RCVTIMEO, &off, sizeof(off));
+  setsockopt(fd, 0, FREERTOS_SO_SNDTIMEO, &off, sizeof(off));
+#elif MG_ARCH == MG_ARCH_FREERTOS_LWIP
+  lwip_fcntl(fd, F_SETFL, O_NONBLOCK);
+#elif MG_ARCH == MG_ARCH_AZURERTOS
+  fcntl(fd, F_SETFL, O_NONBLOCK);
+#else
+  fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);  // Non-blocking mode
+  fcntl(fd, F_SETFD, FD_CLOEXEC);                          // Set close-on-exec
+#endif
+}
+
+static SOCKET mg_open_listener(const char *url, struct mg_addr *addr) {
+  SOCKET fd = INVALID_SOCKET;
+  int s_err = 0;  // Memoized socket error, in case closesocket() overrides it
+  memset(addr, 0, sizeof(*addr));
+  addr->port = mg_htons(mg_url_port(url));
+  if (!mg_aton(mg_url_host(url), addr)) {
+    MG_ERROR(("invalid listening URL: %s", url));
+  } else {
+    union usa usa;
+    socklen_t slen = tousa(addr, &usa);
+    int on = 1, af = addr->is_ip6 ? AF_INET6 : AF_INET;
+    int type = strncmp(url, "udp:", 4) == 0 ? SOCK_DGRAM : SOCK_STREAM;
+    int proto = type == SOCK_DGRAM ? IPPROTO_UDP : IPPROTO_TCP;
+    (void) on;
+
+    if ((fd = socket(af, type, proto)) != INVALID_SOCKET &&
+#if (MG_ARCH != MG_ARCH_WIN32 || !defined(SO_EXCLUSIVEADDRUSE)) && \
+    (!defined(LWIP_SOCKET) || (defined(LWIP_SOCKET) && SO_REUSE == 1))
+        // 1. SO_RESUSEADDR is not enabled on Windows because the semantics of
+        //    SO_REUSEADDR on UNIX and Windows is different. On Windows,
+        //    SO_REUSEADDR allows to bind a socket to a port without error even
+        //    if the port is already open by another program. This is not the
+        //    behavior SO_REUSEADDR was designed for, and leads to hard-to-track
+        //    failure scenarios. Therefore, SO_REUSEADDR was disabled on Windows
+        //    unless SO_EXCLUSIVEADDRUSE is supported and set on a socket.
+        // 2. In case of LWIP, SO_REUSEADDR should be explicitly enabled, by
+        // defining
+        //    SO_REUSE (in lwipopts.h), otherwise the code below will compile
+        //    but won't work! (setsockopt will return EINVAL)
+        !setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on)) &&
+#endif
+#if MG_ARCH == MG_ARCH_WIN32 && defined(SO_EXCLUSIVEADDRUSE) && !defined(WINCE)
+        // "Using SO_REUSEADDR and SO_EXCLUSIVEADDRUSE"
+        //! setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *) &on, sizeof(on))
+        //! &&
+        !setsockopt(fd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char *) &on,
+                    sizeof(on)) &&
+#endif
+        bind(fd, &usa.sa, slen) == 0 &&
+        // NOTE(lsm): FreeRTOS uses backlog value as a connection limit
+        (type == SOCK_DGRAM || listen(fd, MG_SOCK_LISTEN_BACKLOG_SIZE) == 0)) {
+      // In case port was set to 0, get the real port number
+      if (getsockname(fd, &usa.sa, &slen) == 0) {
+        addr->port = usa.sin.sin_port;
+#if MG_ENABLE_IPV6
+        if (addr->is_ip6) addr->port = usa.sin6.sin6_port;
+#endif
+      }
+      mg_set_non_blocking_mode(fd);
+    } else if (fd != INVALID_SOCKET) {
+      s_err = MG_SOCK_ERRNO;
+      closesocket(fd);
+      fd = INVALID_SOCKET;
+    }
+  }
+  if (fd == INVALID_SOCKET) {
+    if (s_err == 0) s_err = MG_SOCK_ERRNO;
+    MG_ERROR(("Failed to listen on %s, errno %d", url, s_err));
+  }
+
+  return fd;
+}
+
+static long mg_sock_recv(struct mg_connection *c, void *buf, size_t len) {
+  long n = 0;
+  if (c->is_udp) {
+    union usa usa;
+    socklen_t slen = tousa(&c->peer, &usa);
+    n = recvfrom(FD(c), (char *) buf, len, 0, &usa.sa, &slen);
+    if (n > 0) tomgaddr(&usa, &c->peer, slen != sizeof(usa.sin));
+  } else {
+    n = recv(FD(c), (char *) buf, len, MSG_NONBLOCKING);
+  }
+  return n == 0 ? -1 : n < 0 && mg_sock_would_block() ? 0 : n;
+}
+
+// NOTE(lsm): do only one iteration of reads, cause some systems
+// (e.g. FreeRTOS stack) return 0 instead of -1/EWOULDBLOCK when no data
+static long read_conn(struct mg_connection *c) {
+  long n = -1;
+  if (c->recv.len >= MG_MAX_RECV_BUF_SIZE) {
+    mg_error(c, "max_recv_buf_size reached");
+  } else if (c->recv.size - c->recv.len < MG_IO_SIZE &&
+             !mg_iobuf_resize(&c->recv, c->recv.size + MG_IO_SIZE)) {
+    mg_error(c, "oom");
+  } else {
+    char *buf = (char *) &c->recv.buf[c->recv.len];
+    size_t len = c->recv.size - c->recv.len;
+    n = c->is_tls ? mg_tls_recv(c, buf, len) : mg_sock_recv(c, buf, len);
+    iolog(c, buf, n, true);
+  }
+  return n;
+}
+
+static void write_conn(struct mg_connection *c) {
+  char *buf = (char *) c->send.buf;
+  size_t len = c->send.len;
+  long n = c->is_tls ? mg_tls_send(c, buf, len) : mg_sock_send(c, buf, len);
+  iolog(c, buf, n, false);
+}
+
+static void close_conn(struct mg_connection *c) {
+  mg_resolve_cancel(c);  // Close any pending DNS query
+  LIST_DELETE(struct mg_connection, &c->mgr->conns, c);
+  if (c == c->mgr->dns4.c) c->mgr->dns4.c = NULL;
+  if (c == c->mgr->dns6.c) c->mgr->dns6.c = NULL;
+  // Order of operations is important. `MG_EV_CLOSE` event must be fired
+  // before we deallocate received data, see #1331
+  mg_call(c, MG_EV_CLOSE, NULL);
+  MG_DEBUG(("%lu closed", c->id));
+  if (FD(c) != INVALID_SOCKET) {
+    closesocket(FD(c));
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+    FreeRTOS_FD_CLR(c->fd, c->mgr->ss, eSELECT_ALL);
+#endif
+    c->fd = S2PTR(INVALID_SOCKET);
+  }
+  mg_tls_free(c);
+  mg_iobuf_free(&c->recv);
+  mg_iobuf_free(&c->send);
+  memset(c, 0, sizeof(*c));
+  free(c);
+}
+
+static void setsockopts(struct mg_connection *c) {
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_AZURERTOS
+  (void) c;
+#else
+  int on = 1;
+#if !defined(SOL_TCP)
+#define SOL_TCP IPPROTO_TCP
+#endif
+  setsockopt(FD(c), SOL_TCP, TCP_NODELAY, (char *) &on, sizeof(on));
+#if defined(TCP_QUICKACK)
+  setsockopt(FD(c), SOL_TCP, TCP_QUICKACK, (char *) &on, sizeof(on));
+#endif
+  setsockopt(FD(c), SOL_SOCKET, SO_KEEPALIVE, (char *) &on, sizeof(on));
+#if (defined(ESP32) && ESP32) || (defined(ESP8266) && ESP8266) || \
+    defined(__linux__)
+  int idle = 60;
+  setsockopt(FD(c), IPPROTO_TCP, TCP_KEEPIDLE, &idle, sizeof(idle));
+#endif
+#if MG_ARCH != MG_ARCH_WIN32 && !defined(__QNX__)
+  {
+    int cnt = 3, intvl = 20;
+    setsockopt(FD(c), IPPROTO_TCP, TCP_KEEPCNT, &cnt, sizeof(cnt));
+    setsockopt(FD(c), IPPROTO_TCP, TCP_KEEPINTVL, &intvl, sizeof(intvl));
+  }
+#endif
+#endif
+}
+
+void mg_connect_resolved(struct mg_connection *c) {
+  // char buf[40];
+  int type = c->is_udp ? SOCK_DGRAM : SOCK_STREAM;
+  int rc, af = c->peer.is_ip6 ? AF_INET6 : AF_INET;
+  // mg_straddr(&c->peer, buf, sizeof(buf));
+  c->fd = S2PTR(socket(af, type, 0));
+  if (FD(c) == INVALID_SOCKET) {
+    mg_error(c, "socket(): %d", MG_SOCK_ERRNO);
+  } else if (c->is_udp) {
+    mg_call(c, MG_EV_RESOLVE, NULL);
+    mg_call(c, MG_EV_CONNECT, NULL);
+  } else {
+    union usa usa;
+    socklen_t slen = tousa(&c->peer, &usa);
+    mg_set_non_blocking_mode(FD(c));
+    setsockopts(c);
+    mg_call(c, MG_EV_RESOLVE, NULL);
+    if ((rc = connect(FD(c), &usa.sa, slen)) == 0) {
+      mg_call(c, MG_EV_CONNECT, NULL);
+    } else if (mg_sock_would_block()) {
+      c->is_connecting = 1;
+    } else {
+      mg_error(c, "connect: %d", MG_SOCK_ERRNO);
+    }
+  }
+}
+
+struct mg_connection *mg_connect(struct mg_mgr *mgr, const char *url,
+                                 mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = NULL;
+  if (url == NULL || url[0] == '\0') {
+    MG_ERROR(("null url"));
+  } else if ((c = alloc_conn(mgr, 1, INVALID_SOCKET)) == NULL) {
+    MG_ERROR(("OOM"));
+  } else {
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+    c->is_udp = (strncmp(url, "udp:", 4) == 0);
+    c->fn = fn;
+    c->fn_data = fn_data;
+    MG_DEBUG(("%lu -> %s", c->id, url));
+    mg_call(c, MG_EV_OPEN, NULL);
+    mg_resolve(c, url);
+  }
+  return c;
+}
+
+static void accept_conn(struct mg_mgr *mgr, struct mg_connection *lsn) {
+  struct mg_connection *c = NULL;
+  union usa usa;
+  socklen_t sa_len = sizeof(usa);
+  SOCKET fd = accept(FD(lsn), &usa.sa, &sa_len);
+  if (fd == INVALID_SOCKET) {
+#if MG_ARCH == MG_ARCH_AZURERTOS
+    // AzureRTOS, in non-block socket mode can mark listening socket readable
+    // even it is not. See comment for 'select' func implementation in nx_bsd.c
+    // That's not an error, just should try later
+    if (MG_SOCK_ERRNO != EAGAIN)
+#endif
+      MG_ERROR(("%lu accept failed, errno %d", lsn->id, MG_SOCK_ERRNO));
+#if ((MG_ARCH != MG_ARCH_WIN32) && (MG_ARCH != MG_ARCH_FREERTOS_TCP))
+  } else if ((long) fd >= FD_SETSIZE) {
+    MG_ERROR(("%ld > %ld", (long) fd, (long) FD_SETSIZE));
+    closesocket(fd);
+#endif
+  } else if ((c = alloc_conn(mgr, 0, fd)) == NULL) {
+    MG_ERROR(("%lu OOM", lsn->id));
+    closesocket(fd);
+  } else {
+    char buf[40];
+    tomgaddr(&usa, &c->peer, sa_len != sizeof(usa.sin));
+    mg_straddr(&c->peer, buf, sizeof(buf));
+    MG_DEBUG(("%lu accepted %s", c->id, buf));
+    mg_set_non_blocking_mode(FD(c));
+    setsockopts(c);
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+    c->is_accepted = 1;
+    c->is_hexdumping = lsn->is_hexdumping;
+    c->pfn = lsn->pfn;
+    c->pfn_data = lsn->pfn_data;
+    c->fn = lsn->fn;
+    c->fn_data = lsn->fn_data;
+    mg_call(c, MG_EV_OPEN, NULL);
+    mg_call(c, MG_EV_ACCEPT, NULL);
+  }
+}
+
+static bool mg_socketpair(SOCKET sp[2], union usa usa[2]) {
+  socklen_t n = sizeof(usa[0].sin);
+  bool result = false;
+
+  (void) memset(&usa[0], 0, sizeof(usa[0]));
+  usa[0].sin.sin_family = AF_INET;
+  *(uint32_t *) &usa->sin.sin_addr = mg_htonl(0x7f000001);  // 127.0.0.1
+  usa[1] = usa[0];
+
+  if ((sp[0] = socket(AF_INET, SOCK_DGRAM, 0)) != INVALID_SOCKET &&
+      (sp[1] = socket(AF_INET, SOCK_DGRAM, 0)) != INVALID_SOCKET &&
+      bind(sp[0], &usa[0].sa, n) == 0 && bind(sp[1], &usa[1].sa, n) == 0 &&
+      getsockname(sp[0], &usa[0].sa, &n) == 0 &&
+      getsockname(sp[1], &usa[1].sa, &n) == 0 &&
+      connect(sp[0], &usa[1].sa, n) == 0 &&
+      connect(sp[1], &usa[0].sa, n) == 0) {
+    mg_set_non_blocking_mode(sp[1]);  // Set close-on-exec
+    result = true;
+  } else {
+    if (sp[0] != INVALID_SOCKET) closesocket(sp[0]);
+    if (sp[1] != INVALID_SOCKET) closesocket(sp[1]);
+    sp[0] = sp[1] = INVALID_SOCKET;
+  }
+
+  return result;
+}
+
+void mg_mgr_wakeup(struct mg_connection *c, const void *buf, size_t len) {
+  if (buf == NULL || len == 0) buf = (void *) "", len = 1;
+  send((SOCKET) (size_t) c->pfn_data, (const char *) buf, len, MSG_NONBLOCKING);
+}
+
+static void pf1(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_READ) {
+    mg_iobuf_free(&c->recv);
+  } else if (ev == MG_EV_CLOSE) {
+    closesocket((SOCKET) (size_t) c->pfn_data);
+  }
+  (void) ev_data, (void) fn_data;
+}
+
+struct mg_connection *mg_mkpipe(struct mg_mgr *mgr, mg_event_handler_t fn,
+                                void *fn_data) {
+  union usa usa[2];
+  SOCKET sp[2] = {INVALID_SOCKET, INVALID_SOCKET};
+  struct mg_connection *c = NULL;
+  if (!mg_socketpair(sp, usa)) {
+    MG_ERROR(("Cannot create socket pair"));
+  } else if ((c = alloc_conn(mgr, false, sp[1])) == NULL) {
+    closesocket(sp[0]);
+    closesocket(sp[1]);
+    MG_ERROR(("OOM"));
+  } else {
+    MG_DEBUG(("pipe %lu", (unsigned long) sp[0]));
+    tomgaddr(&usa[0], &c->peer, false);
+    c->is_udp = 1;
+    c->pfn = pf1;
+    c->pfn_data = (void *) (size_t) sp[0];
+    c->fn = fn;
+    c->fn_data = fn_data;
+    mg_call(c, MG_EV_OPEN, NULL);
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+  }
+  return c;
+}
+
+struct mg_connection *mg_listen(struct mg_mgr *mgr, const char *url,
+                                mg_event_handler_t fn, void *fn_data) {
+  struct mg_connection *c = NULL;
+  bool is_udp = strncmp(url, "udp:", 4) == 0;
+  struct mg_addr addr;
+  SOCKET fd = mg_open_listener(url, &addr);
+  if (fd == INVALID_SOCKET) {
+    MG_ERROR(("Failed: %s, errno %d", url, MG_SOCK_ERRNO));
+  } else if ((c = alloc_conn(mgr, 0, fd)) == NULL) {
+    MG_ERROR(("OOM %s", url));
+    closesocket(fd);
+  } else {
+    memcpy(&c->peer, &addr, sizeof(struct mg_addr));
+    c->fd = S2PTR(fd);
+    c->is_listening = 1;
+    c->is_udp = is_udp;
+    LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
+    c->fn = fn;
+    c->fn_data = fn_data;
+    mg_call(c, MG_EV_OPEN, NULL);
+    MG_DEBUG(("%lu %s port %u", c->id, url, mg_ntohs(c->peer.port)));
+  }
+  return c;
+}
+
+static void mg_iotest(struct mg_mgr *mgr, int ms) {
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+  struct mg_connection *c;
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    if (c->is_closing || c->is_resolving || FD(c) == INVALID_SOCKET) continue;
+    FreeRTOS_FD_SET(c->fd, mgr->ss, eSELECT_READ | eSELECT_EXCEPT);
+    if (c->is_connecting || (c->send.len > 0 && c->is_tls_hs == 0))
+      FreeRTOS_FD_SET(c->fd, mgr->ss, eSELECT_WRITE);
+  }
+  FreeRTOS_select(mgr->ss, pdMS_TO_TICKS(ms));
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    EventBits_t bits = FreeRTOS_FD_ISSET(c->fd, mgr->ss);
+    c->is_readable = bits & (eSELECT_READ | eSELECT_EXCEPT) ? 1 : 0;
+    c->is_writable = bits & eSELECT_WRITE ? 1 : 0;
+    FreeRTOS_FD_CLR(c->fd, mgr->ss,
+                    eSELECT_READ | eSELECT_EXCEPT | eSELECT_WRITE);
+  }
+#else
+  struct timeval tv = {ms / 1000, (ms % 1000) * 1000};
+  struct mg_connection *c;
+  fd_set rset, wset;
+  SOCKET maxfd = 0;
+  int rc;
+
+  FD_ZERO(&rset);
+  FD_ZERO(&wset);
+
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    if (c->is_closing || c->is_resolving || FD(c) == INVALID_SOCKET) continue;
+    FD_SET(FD(c), &rset);
+    if (FD(c) > maxfd) maxfd = FD(c);
+    if (c->is_connecting || (c->send.len > 0 && c->is_tls_hs == 0))
+      FD_SET(FD(c), &wset);
+  }
+
+  if ((rc = select((int) maxfd + 1, &rset, &wset, NULL, &tv)) < 0) {
+    MG_DEBUG(("select: %d %d", rc, MG_SOCK_ERRNO));
+    FD_ZERO(&rset);
+    FD_ZERO(&wset);
+  }
+
+  for (c = mgr->conns; c != NULL; c = c->next) {
+    // TLS might have stuff buffered, so dig everything
+    c->is_readable = FD(c) != INVALID_SOCKET && FD_ISSET(FD(c), &rset);
+    c->is_writable = FD(c) != INVALID_SOCKET && FD_ISSET(FD(c), &wset);
+  }
+#endif
+}
+
+static void connect_conn(struct mg_connection *c) {
+  int rc = 0;
+#if MG_ARCH != MG_ARCH_FREERTOS_TCP
+  socklen_t len = sizeof(rc);
+  if (getsockopt(FD(c), SOL_SOCKET, SO_ERROR, (char *) &rc, &len)) rc = 1;
+#endif
+  if (rc == EAGAIN || rc == EWOULDBLOCK) rc = 0;
+  c->is_connecting = 0;
+  if (rc) {
+    char buf[50];
+    mg_error(c, "error connecting to %s",
+             mg_straddr(&c->peer, buf, sizeof(buf)));
+  } else {
+    if (c->is_tls_hs) mg_tls_handshake(c);
+    mg_call(c, MG_EV_CONNECT, NULL);
+  }
+}
+
+void mg_mgr_poll(struct mg_mgr *mgr, int ms) {
+  struct mg_connection *c, *tmp;
+  int64_t now;
+
+  mg_iotest(mgr, ms);
+  now = mg_millis();
+  mg_timer_poll(now);
+
+  for (c = mgr->conns; c != NULL; c = tmp) {
+    tmp = c->next;
+    mg_call(c, MG_EV_POLL, &now);
+    MG_VERBOSE(("%lu %c%c %c%c%c%c%c", c->id, c->is_readable ? 'r' : '-',
+                c->is_writable ? 'w' : '-', c->is_tls ? 'T' : 't',
+                c->is_connecting ? 'C' : 'c', c->is_tls_hs ? 'H' : 'h',
+                c->is_resolving ? 'R' : 'r', c->is_closing ? 'C' : 'c'));
+    if (c->is_resolving || c->is_closing) {
+      // Do nothing
+    } else if (c->is_listening && c->is_udp == 0) {
+      if (c->is_readable) accept_conn(mgr, c);
+    } else if (c->is_connecting) {
+      if (c->is_readable || c->is_writable) connect_conn(c);
+    } else if (c->is_tls_hs) {
+      if ((c->is_readable || c->is_writable)) mg_tls_handshake(c);
+    } else {
+      if (c->is_readable) read_conn(c);
+      if (c->is_writable) write_conn(c);
+      while (c->is_tls && read_conn(c) > 0) (void) 0;  // Read buffered TLS data
+    }
+
+    if (c->is_draining && c->send.len == 0) c->is_closing = 1;
+    if (c->is_closing) close_conn(c);
+  }
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/ssi.c"
+#endif
+
+
+
+
+#ifndef MG_MAX_SSI_DEPTH
+#define MG_MAX_SSI_DEPTH 5
+#endif
+
+#if MG_ENABLE_SSI
+static char *mg_ssi(const char *path, const char *root, int depth) {
+  struct mg_iobuf b = {NULL, 0, 0};
+  FILE *fp = fopen(path, "rb");
+  if (fp != NULL) {
+    char buf[BUFSIZ], arg[sizeof(buf)];
+    int ch, intag = 0;
+    size_t len = 0, align = MG_IO_SIZE;
+    while ((ch = fgetc(fp)) != EOF) {
+      if (intag && ch == '>' && buf[len - 1] == '-' && buf[len - 2] == '-') {
+        buf[len++] = (char) (ch & 0xff);
+        if (sscanf(buf, "<!--#include file=\"%[^\"]", arg)) {
+          char tmp[MG_PATH_MAX + BUFSIZ + 10],
+              *p = (char *) path + strlen(path), *data;
+          while (p > path && p[-1] != MG_DIRSEP && p[-1] != '/') p--;
+          mg_snprintf(tmp, sizeof(tmp), "%.*s%s", (int) (p - path), path, arg);
+          if (depth < MG_MAX_SSI_DEPTH &&
+              (data = mg_ssi(tmp, root, depth + 1)) != NULL) {
+            mg_iobuf_add(&b, b.len, data, strlen(data), align);
+            free(data);
+          } else {
+            MG_ERROR(("%s: file=%s error or too deep", path, arg));
+          }
+        } else if (sscanf(buf, "<!--#include virtual=\"%[^\"]", arg)) {
+          char tmp[MG_PATH_MAX + BUFSIZ + 10], *data;
+          mg_snprintf(tmp, sizeof(tmp), "%s%s", root, arg);
+          if (depth < MG_MAX_SSI_DEPTH &&
+              (data = mg_ssi(tmp, root, depth + 1)) != NULL) {
+            mg_iobuf_add(&b, b.len, data, strlen(data), align);
+            free(data);
+          } else {
+            MG_ERROR(("%s: virtual=%s error or too deep", path, arg));
+          }
+        } else {
+          // Unknown SSI tag
+          MG_ERROR(("Unknown SSI tag: %.*s", (int) len, buf));
+          mg_iobuf_add(&b, b.len, buf, len, align);
+        }
+        intag = 0;
+        len = 0;
+      } else if (ch == '<') {
+        intag = 1;
+        if (len > 0) mg_iobuf_add(&b, b.len, buf, len, align);
+        len = 0;
+        buf[len++] = (char) (ch & 0xff);
+      } else if (intag) {
+        if (len == 5 && strncmp(buf, "<!--#", 5) != 0) {
+          intag = 0;
+        } else if (len >= sizeof(buf) - 2) {
+          MG_ERROR(("%s: SSI tag is too large", path));
+          len = 0;
+        }
+        buf[len++] = (char) (ch & 0xff);
+      } else {
+        buf[len++] = (char) (ch & 0xff);
+        if (len >= sizeof(buf)) {
+          mg_iobuf_add(&b, b.len, buf, len, align);
+          len = 0;
+        }
+      }
+    }
+    if (len > 0) mg_iobuf_add(&b, b.len, buf, len, align);
+    if (b.len > 0) mg_iobuf_add(&b, b.len, "", 1, align);  // nul-terminate
+    fclose(fp);
+  }
+  (void) depth;
+  (void) root;
+  return (char *) b.buf;
+}
+
+void mg_http_serve_ssi(struct mg_connection *c, const char *root,
+                       const char *fullpath) {
+  const char *headers = "Content-Type: text/html; charset=utf-8\r\n";
+  char *data = mg_ssi(fullpath, root, 0);
+  mg_http_reply(c, 200, headers, "%s", data == NULL ? "" : data);
+  free(data);
+}
+#else
+void mg_http_serve_ssi(struct mg_connection *c, const char *root,
+                       const char *fullpath) {
+  mg_http_reply(c, 501, NULL, "SSI not enabled");
+  (void) root, (void) fullpath;
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/str.c"
+#endif
+
+#include <stdlib.h>
+
+struct mg_str mg_str_s(const char *s) {
+  struct mg_str str = {s, s == NULL ? 0 : strlen(s)};
+  return str;
+}
+
+struct mg_str mg_str_n(const char *s, size_t n) {
+  struct mg_str str = {s, n};
+  return str;
+}
+
+int mg_lower(const char *s) {
+  return tolower(*(const unsigned char *) s);
+}
+
+int mg_ncasecmp(const char *s1, const char *s2, size_t len) {
+  int diff = 0;
+  if (len > 0) do {
+      diff = mg_lower(s1++) - mg_lower(s2++);
+    } while (diff == 0 && s1[-1] != '\0' && --len > 0);
+  return diff;
+}
+
+int mg_casecmp(const char *s1, const char *s2) {
+  return mg_ncasecmp(s1, s2, (size_t) ~0);
+}
+
+int mg_vcmp(const struct mg_str *s1, const char *s2) {
+  size_t n2 = strlen(s2), n1 = s1->len;
+  int r = strncmp(s1->ptr, s2, (n1 < n2) ? n1 : n2);
+  if (r == 0) return (int) (n1 - n2);
+  return r;
+}
+
+int mg_vcasecmp(const struct mg_str *str1, const char *str2) {
+  size_t n2 = strlen(str2), n1 = str1->len;
+  int r = mg_ncasecmp(str1->ptr, str2, (n1 < n2) ? n1 : n2);
+  if (r == 0) return (int) (n1 - n2);
+  return r;
+}
+
+struct mg_str mg_strdup(const struct mg_str s) {
+  struct mg_str r = {NULL, 0};
+  if (s.len > 0 && s.ptr != NULL) {
+    char *sc = (char *) calloc(1, s.len + 1);
+    if (sc != NULL) {
+      memcpy(sc, s.ptr, s.len);
+      sc[s.len] = '\0';
+      r.ptr = sc;
+      r.len = s.len;
+    }
+  }
+  return r;
+}
+
+int mg_strcmp(const struct mg_str str1, const struct mg_str str2) {
+  size_t i = 0;
+  while (i < str1.len && i < str2.len) {
+    int c1 = str1.ptr[i];
+    int c2 = str2.ptr[i];
+    if (c1 < c2) return -1;
+    if (c1 > c2) return 1;
+    i++;
+  }
+  if (i < str1.len) return 1;
+  if (i < str2.len) return -1;
+  return 0;
+}
+
+const char *mg_strstr(const struct mg_str haystack,
+                      const struct mg_str needle) {
+  size_t i;
+  if (needle.len > haystack.len) return NULL;
+  for (i = 0; i <= haystack.len - needle.len; i++) {
+    if (memcmp(haystack.ptr + i, needle.ptr, needle.len) == 0) {
+      return haystack.ptr + i;
+    }
+  }
+  return NULL;
+}
+
+struct mg_str mg_strstrip(struct mg_str s) {
+  while (s.len > 0 && isspace((int) *s.ptr)) s.ptr++, s.len--;
+  while (s.len > 0 && isspace((int) *(s.ptr + s.len - 1))) s.len--;
+  return s;
+}
+
+bool mg_match(struct mg_str s, struct mg_str p, struct mg_str *caps) {
+  size_t i = 0, j = 0, ni = 0, nj = 0;
+  if (caps) caps->ptr = NULL, caps->len = 0;
+  while (i < p.len || j < s.len) {
+    if (i < p.len && j < s.len && (p.ptr[i] == '?' || s.ptr[j] == p.ptr[i])) {
+      if (caps == NULL) {
+      } else if (p.ptr[i] == '?') {
+        caps->ptr = &s.ptr[j], caps->len = 1;     // Finalize `?` cap
+        caps++, caps->ptr = NULL, caps->len = 0;  // Init next cap
+      } else if (caps->ptr != NULL && caps->len == 0) {
+        caps->len = (size_t) (&s.ptr[j] - caps->ptr);  // Finalize current cap
+        caps++, caps->len = 0, caps->ptr = NULL;       // Init next cap
+      }
+      i++, j++;
+    } else if (i < p.len && (p.ptr[i] == '*' || p.ptr[i] == '#')) {
+      if (caps && !caps->ptr) caps->len = 0, caps->ptr = &s.ptr[j];  // Init cap
+      ni = i++, nj = j + 1;
+    } else if (nj > 0 && nj <= s.len && (p.ptr[ni] == '#' || s.ptr[j] != '/')) {
+      i = ni, j = nj;
+      if (caps && caps->ptr == NULL && caps->len == 0) {
+        caps--, caps->len = 0;  // Restart previous cap
+      }
+    } else {
+      return false;
+    }
+  }
+  if (caps && caps->ptr && caps->len == 0) {
+    caps->len = (size_t) (&s.ptr[j] - caps->ptr);
+  }
+  return true;
+}
+
+bool mg_globmatch(const char *s1, size_t n1, const char *s2, size_t n2) {
+  return mg_match(mg_str_n(s2, n2), mg_str_n(s1, n1), NULL);
+}
+
+static size_t mg_nce(const char *s, size_t n, size_t ofs, size_t *koff,
+                     size_t *klen, size_t *voff, size_t *vlen) {
+  size_t kvlen, kl;
+  for (kvlen = 0; ofs + kvlen < n && s[ofs + kvlen] != ',';) kvlen++;
+  for (kl = 0; kl < kvlen && s[ofs + kl] != '=';) kl++;
+  if (koff != NULL) *koff = ofs;
+  if (klen != NULL) *klen = kl;
+  if (voff != NULL) *voff = kl < kvlen ? ofs + kl + 1 : 0;
+  if (vlen != NULL) *vlen = kl < kvlen ? kvlen - kl - 1 : 0;
+  ofs += kvlen + 1;
+  return ofs > n ? n : ofs;
+}
+
+bool mg_commalist(struct mg_str *s, struct mg_str *k, struct mg_str *v) {
+  size_t koff = 0, klen = 0, voff = 0, vlen = 0, off = 0;
+  if (s->ptr == NULL || s->len == 0) return 0;
+  off = mg_nce(s->ptr, s->len, 0, &koff, &klen, &voff, &vlen);
+  if (k != NULL) *k = mg_str_n(s->ptr + koff, klen);
+  if (v != NULL) *v = mg_str_n(s->ptr + voff, vlen);
+  *s = mg_str_n(s->ptr + off, s->len - off);
+  return off > 0;
+}
+
+size_t mg_snprintf(char *buf, size_t len, const char *fmt, ...) {
+  va_list ap;
+  size_t n;
+  va_start(ap, fmt);
+  n = mg_vsnprintf(buf, len, fmt, ap);
+  va_end(ap);
+  return n;
+}
+
+char *mg_hexdump(const void *buf, size_t len) {
+  const unsigned char *p = (const unsigned char *) buf;
+  size_t i, idx, n = 0, ofs = 0, dlen = len * 5 + 100;
+  char ascii[17] = "", *dst = (char *) calloc(1, dlen);
+  if (dst == NULL) return dst;
+  for (i = 0; i < len; i++) {
+    idx = i % 16;
+    if (idx == 0) {
+      if (i > 0 && dlen > n)
+        n += mg_snprintf(dst + n, dlen - n, "  %s\n", ascii);
+      if (dlen > n)
+        n += mg_snprintf(dst + n, dlen - n, "%04x ", (int) (i + ofs));
+    }
+    if (dlen < n) break;
+    n += mg_snprintf(dst + n, dlen - n, " %02x", p[i]);
+    ascii[idx] = (char) (p[i] < 0x20 || p[i] > 0x7e ? '.' : p[i]);
+    ascii[idx + 1] = '\0';
+  }
+  while (i++ % 16) {
+    if (n < dlen) n += mg_snprintf(dst + n, dlen - n, "%s", "   ");
+  }
+  if (n < dlen) n += mg_snprintf(dst + n, dlen - n, "  %s\n", ascii);
+  if (n > dlen - 1) n = dlen - 1;
+  dst[n] = '\0';
+  return dst;
+}
+
+char *mg_hex(const void *buf, size_t len, char *to) {
+  const unsigned char *p = (const unsigned char *) buf;
+  static const char *hex = "0123456789abcdef";
+  size_t i = 0;
+  for (; len--; p++) {
+    to[i++] = hex[p[0] >> 4];
+    to[i++] = hex[p[0] & 0x0f];
+  }
+  to[i] = '\0';
+  return to;
+}
+
+static unsigned char mg_unhex_nimble(unsigned char c) {
+  return (c >= '0' && c <= '9')   ? (unsigned char) (c - '0')
+         : (c >= 'A' && c <= 'F') ? (unsigned char) (c - '7')
+                                  : (unsigned char) (c - 'W');
+}
+
+unsigned long mg_unhexn(const char *s, size_t len) {
+  unsigned long i = 0, v = 0;
+  for (i = 0; i < len; i++) v <<= 4, v |= mg_unhex_nimble(((uint8_t *) s)[i]);
+  return v;
+}
+
+void mg_unhex(const char *buf, size_t len, unsigned char *to) {
+  size_t i;
+  for (i = 0; i < len; i += 2) {
+    to[i >> 1] = (unsigned char) mg_unhexn(&buf[i], 2);
+  }
+}
+
+size_t mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap) {
+  va_list ap_copy;
+  size_t len;
+
+  va_copy(ap_copy, ap);
+  len = mg_vsnprintf(*buf, size, fmt, ap_copy);
+  va_end(ap_copy);
+
+  if (len >= size) {
+    //  Allocate a buffer that is large enough
+    if ((*buf = (char *) calloc(1, len + 1)) == NULL) {
+      len = 0;
+    } else {
+      va_copy(ap_copy, ap);
+      len = mg_vsnprintf(*buf, len + 1, fmt, ap_copy);
+      va_end(ap_copy);
+    }
+  }
+
+  return len;
+}
+
+size_t mg_asprintf(char **buf, size_t size, const char *fmt, ...) {
+  size_t ret;
+  va_list ap;
+  va_start(ap, fmt);
+  ret = mg_vasprintf(buf, size, fmt, ap);
+  va_end(ap);
+  return ret;
+}
+
+int64_t mg_to64(struct mg_str str) {
+  int64_t result = 0, neg = 1, max = 922337203685477570 /* INT64_MAX/10-10 */;
+  size_t i = 0;
+  while (i < str.len && (str.ptr[i] == ' ' || str.ptr[i] == '\t')) i++;
+  if (i < str.len && str.ptr[i] == '-') neg = -1, i++;
+  while (i < str.len && str.ptr[i] >= '0' && str.ptr[i] <= '9') {
+    if (result > max) return 0;
+    result *= 10;
+    result += (str.ptr[i] - '0');
+    i++;
+  }
+  return result * neg;
+}
+
+size_t mg_lld(char *buf, int64_t val, bool is_signed, bool is_hex) {
+  const char *letters = "0123456789abcdef";
+  uint64_t v = (uint64_t) val;
+  size_t s = 0, n, i;
+  if (is_signed && val < 0) buf[s++] = '-', v = (uint64_t) (-val);
+  // This loop prints a number in reverse order. I guess this is because we
+  // write numbers from right to left: least significant digit comes last.
+  // Maybe because we use Arabic numbers, and Arabs write RTL?
+  if (is_hex) {
+    for (n = 0; v; v >>= 4) buf[s + n++] = letters[v & 15];
+  } else {
+    for (n = 0; v; v /= 10) buf[s + n++] = letters[v % 10];
+  }
+  // Reverse a string
+  for (i = 0; i < n / 2; i++) {
+    char t = buf[s + i];
+    buf[s + i] = buf[s + n - i - 1], buf[s + n - i - 1] = t;
+  }
+  if (val == 0) buf[n++] = '0';  // Handle special case
+  return n + s;
+}
+
+static size_t mg_copys(char *buf, size_t len, size_t n, char *p, size_t k) {
+  size_t j = 0;
+  for (j = 0; j < k && p[j]; j++)
+    if (j + n < len) buf[n + j] = p[j];
+  return j;
+}
+
+size_t mg_vsnprintf(char *buf, size_t len, const char *fmt, va_list ap) {
+  size_t i = 0, n = 0;
+  while (fmt[i] != '\0') {
+    if (fmt[i] == '%') {
+      size_t j, k, x = 0, is_long = 0, w = 0 /* width */, pr = 0 /* prec */;
+      char pad = ' ', minus = 0, c = fmt[++i];
+      if (c == '#') x++, c = fmt[++i];
+      if (c == '-') minus++, c = fmt[++i];
+      if (c == '0') pad = '0', c = fmt[++i];
+      while (isdigit(c)) w *= 10, w += (size_t) (c - '0'), c = fmt[++i];
+      if (c == '.') {
+        c = fmt[++i];
+        if (c == '*') {
+          pr = (size_t) va_arg(ap, int);
+          c = fmt[++i];
+        } else {
+          while (isdigit(c)) pr *= 10, pr += (size_t) (c - '0'), c = fmt[++i];
+        }
+      }
+      while (c == 'h') c = fmt[++i];  // Treat h and hh as int
+      if (c == 'l') {
+        is_long++, c = fmt[++i];
+        if (c == 'l') is_long++, c = fmt[++i];
+      }
+      if (c == 'p') x = 1, is_long = 1;
+      if (c == 'd' || c == 'u' || c == 'x' || c == 'X' || c == 'p') {
+        bool s = (c == 'd'), h = (c == 'x' || c == 'X' || c == 'p');
+        char tmp[30];
+        size_t xl = x ? 2 : 0;
+        if (is_long == 2) {
+          int64_t v = va_arg(ap, int64_t);
+          k = mg_lld(tmp, v, s, h);
+        } else if (is_long == 1) {
+          long v = va_arg(ap, long);
+          k = mg_lld(tmp, s ? (int64_t) v : (int64_t) (unsigned long) v, s, h);
+        } else {
+          int v = va_arg(ap, int);
+          k = mg_lld(tmp, s ? (int64_t) v : (int64_t) (unsigned) v, s, h);
+        }
+        for (j = 0; j < xl && w > 0; j++) w--;
+        for (j = 0; pad == ' ' && !minus && k < w && j + k < w; j++)
+          n += mg_copys(buf, len, n, &pad, 1);
+        n += mg_copys(buf, len, n, (char *) "0x", xl);
+        for (j = 0; pad == '0' && k < w && j + k < w; j++)
+          n += mg_copys(buf, len, n, &pad, 1);
+        n += mg_copys(buf, len, n, tmp, k);
+        for (j = 0; pad == ' ' && minus && k < w && j + k < w; j++)
+          n += mg_copys(buf, len, n, &pad, 1);
+      } else if (c == 'c') {
+        int p = va_arg(ap, int);
+        if (n < len) buf[n] = (char) p;
+        n++;
+      } else if (c == 's') {
+        char *p = va_arg(ap, char *);
+        if (pr == 0) pr = p == NULL ? 0 : strlen(p);
+        for (j = 0; !minus && pr < w && j + pr < w; j++)
+          n += mg_copys(buf, len, n, &pad, 1);
+        n += mg_copys(buf, len, n, p, pr);
+        for (j = 0; minus && pr < w && j + pr < w; j++)
+          n += mg_copys(buf, len, n, &pad, 1);
+      } else if (c == '%') {
+        if (n < len) buf[n] = '%';
+        n++;
+      } else {
+        abort();  // Unsupported format specifier
+      }
+      i++;
+    } else {
+      if (n < len) buf[n] = fmt[i];
+      n++, i++;
+    }
+  }
+  if (n < len) buf[n] = '\0';
+  return n;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/timer.c"
+#endif
+// Copyright (c) Cesanta Software Limited
+// All rights reserved
+
+
+
+
+struct mg_timer *g_timers;
+
+void mg_timer_init(struct mg_timer *t, int64_t ms, unsigned flags,
+                   void (*fn)(void *), void *arg) {
+  struct mg_timer tmp = {ms, 0UL, flags, fn, arg, g_timers};
+  *t = tmp;
+  g_timers = t;
+  if (flags & MG_TIMER_RUN_NOW) fn(arg);
+}
+
+void mg_timer_free(struct mg_timer *t) {
+  struct mg_timer **head = &g_timers;
+  while (*head && *head != t) head = &(*head)->next;
+  if (*head) *head = t->next;
+}
+
+void mg_timer_poll(int64_t now_ms) {
+  // If time goes back (wrapped around), reset timers
+  struct mg_timer *t, *tmp;
+  static int64_t oldnow;  // Timestamp in a previous invocation
+  if (oldnow > now_ms) {  // If it is wrapped, reset timers
+    for (t = g_timers; t != NULL; t = t->next) t->expire = 0;
+  }
+  oldnow = now_ms;
+
+  for (t = g_timers; t != NULL; t = tmp) {
+    tmp = t->next;
+    if (t->expire == 0) t->expire = now_ms + t->period_ms;
+    if (t->expire > now_ms) continue;
+    t->fn(t->arg);
+    // Try to tick timers with the given period as accurate as possible,
+    // even if this polling function is called with some random period.
+    t->expire = now_ms - t->expire > t->period_ms ? now_ms + t->period_ms
+                                                  : t->expire + t->period_ms;
+    if (!(t->flags & MG_TIMER_REPEAT)) mg_timer_free(t);
+  }
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/tls_dummy.c"
+#endif
+
+
+#if !MG_ENABLE_MBEDTLS && !MG_ENABLE_OPENSSL && !MG_ENABLE_CUSTOM_TLS
+void mg_tls_init(struct mg_connection *c, struct mg_tls_opts *opts) {
+  (void) opts;
+  mg_error(c, "TLS is not enabled");
+}
+void mg_tls_handshake(struct mg_connection *c) {
+  (void) c;
+}
+void mg_tls_free(struct mg_connection *c) {
+  (void) c;
+}
+long mg_tls_recv(struct mg_connection *c, void *buf, size_t len) {
+  return c == NULL || buf == NULL || len == 0 ? 0 : -1;
+}
+long mg_tls_send(struct mg_connection *c, const void *buf, size_t len) {
+  return c == NULL || buf == NULL || len == 0 ? 0 : -1;
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/tls_mbed.c"
+#endif
+
+
+
+#if MG_ENABLE_MBEDTLS
+
+#if defined(MBEDTLS_VERSION_NUMBER) && MBEDTLS_VERSION_NUMBER >= 0x03000000
+#define MGRNG , rng_get, NULL
+#else
+#define MGRNG
+#endif
+
+void mg_tls_free(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  if (tls != NULL) {
+    free(tls->cafile);
+    mbedtls_ssl_free(&tls->ssl);
+    mbedtls_pk_free(&tls->pk);
+    mbedtls_x509_crt_free(&tls->ca);
+    mbedtls_x509_crl_free(&tls->crl);
+    mbedtls_x509_crt_free(&tls->cert);
+    mbedtls_ssl_config_free(&tls->conf);
+    free(tls);
+    c->tls = NULL;
+  }
+}
+
+static bool mg_wouldblock(int n) {
+  return n < 0 &&
+         (errno == EINPROGRESS || errno == EAGAIN || errno == EWOULDBLOCK);
+}
+
+static int mg_net_send(void *ctx, const unsigned char *buf, size_t len) {
+  int fd = *(int *) ctx;
+  int n = (int) send(fd, buf, len, 0);
+  if (n > 0) return n;
+  if (mg_wouldblock(n)) return MBEDTLS_ERR_SSL_WANT_WRITE;
+  return MBEDTLS_ERR_NET_SEND_FAILED;
+}
+
+static int mg_net_recv(void *ctx, unsigned char *buf, size_t len) {
+  int fd = *(int *) ctx;
+  int n = (int) recv(fd, buf, len, 0);
+  if (n > 0) return n;
+  if (mg_wouldblock(n)) return MBEDTLS_ERR_SSL_WANT_READ;
+  return MBEDTLS_ERR_NET_RECV_FAILED;
+}
+
+void mg_tls_handshake(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int rc;
+  mbedtls_ssl_set_bio(&tls->ssl, &c->fd, mg_net_send, mg_net_recv, 0);
+  rc = mbedtls_ssl_handshake(&tls->ssl);
+  if (rc == 0) {  // Success
+    MG_DEBUG(("%lu success", c->id));
+    c->is_tls_hs = 0;
+  } else if (rc == MBEDTLS_ERR_SSL_WANT_READ ||
+             rc == MBEDTLS_ERR_SSL_WANT_WRITE) {  // Still pending
+    MG_VERBOSE(("%lu pending, %d%d %d (-%#x)", c->id, c->is_connecting,
+                c->is_tls_hs, rc, -rc));
+  } else {
+    mg_error(c, "TLS handshake: -%#x", -rc);  // Error
+  }
+}
+
+static int mbed_rng(void *ctx, unsigned char *buf, size_t len) {
+  mg_random(buf, len);
+  (void) ctx;
+  return 0;
+}
+
+static void debug_cb(void *c, int lev, const char *s, int n, const char *s2) {
+  n = (int) strlen(s2) - 1;
+  MG_VERBOSE(("%p %.*s", ((struct mg_connection *) c)->fd, n, s2));
+  (void) s;
+  (void) c;
+  (void) lev;
+}
+
+#if defined(MBEDTLS_VERSION_NUMBER) && MBEDTLS_VERSION_NUMBER >= 0x03000000
+static int rng_get(void *p_rng, unsigned char *buf, size_t len) {
+  (void) p_rng;
+  mg_random(buf, len);
+  return 0;
+}
+#endif
+
+static struct mg_str mg_loadfile(struct mg_fs *fs, const char *path) {
+  size_t n = 0;
+  if (path[0] == '-') return mg_str(path);
+  char *p = mg_file_read(fs, path, &n);
+  return mg_str_n(p, n);
+}
+
+void mg_tls_init(struct mg_connection *c, struct mg_tls_opts *opts) {
+  struct mg_fs *fs = opts->fs == NULL ? &mg_fs_posix : opts->fs;
+  struct mg_tls *tls = (struct mg_tls *) calloc(1, sizeof(*tls));
+  int rc = 0;
+  c->tls = tls;
+  if (c->tls == NULL) {
+    mg_error(c, "TLS OOM");
+    goto fail;
+  }
+  MG_DEBUG(("%lu Setting TLS", c->id));
+  mbedtls_ssl_init(&tls->ssl);
+  mbedtls_ssl_config_init(&tls->conf);
+  mbedtls_x509_crt_init(&tls->ca);
+  mbedtls_x509_crl_init(&tls->crl);
+  mbedtls_x509_crt_init(&tls->cert);
+  mbedtls_pk_init(&tls->pk);
+  mbedtls_ssl_conf_dbg(&tls->conf, debug_cb, c);
+  if ((rc = mbedtls_ssl_config_defaults(
+           &tls->conf,
+           c->is_client ? MBEDTLS_SSL_IS_CLIENT : MBEDTLS_SSL_IS_SERVER,
+           MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
+    mg_error(c, "tls defaults %#x", -rc);
+    goto fail;
+  }
+  mbedtls_ssl_conf_rng(&tls->conf, mbed_rng, c);
+  if (opts->ca == NULL || strcmp(opts->ca, "*") == 0) {
+    mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_NONE);
+  } else if (opts->ca != NULL && opts->ca[0] != '\0') {
+    if (opts->crl != NULL && opts->crl[0] != '\0') {
+      struct mg_str s = mg_loadfile(fs, opts->crl);
+      rc = mbedtls_x509_crl_parse(&tls->crl, (uint8_t *) s.ptr, s.len + 1);
+      if (opts->crl[0] != '-') free((char *) s.ptr);
+      if (rc != 0) {
+        mg_error(c, "parse(%s) err %#x", opts->crl, -rc);
+        goto fail;
+      }
+    }
+#if defined(MBEDTLS_X509_CA_CHAIN_ON_DISK)
+    tls->cafile = strdup(opts->ca);
+    rc = mbedtls_ssl_conf_ca_chain_file(&tls->conf, tls->cafile, &tls->crl);
+    if (rc != 0) {
+      mg_error(c, "parse on-disk chain(%s) err %#x", ca, -rc);
+      goto fail;
+    }
+#else
+    struct mg_str s = mg_loadfile(fs, opts->ca);
+    rc = mbedtls_x509_crt_parse(&tls->ca, (uint8_t *) s.ptr, s.len + 1);
+    if (opts->ca[0] != '-') free((char *) s.ptr);
+    if (rc != 0) {
+      mg_error(c, "parse(%s) err %#x", opts->ca, -rc);
+      goto fail;
+    }
+    mbedtls_ssl_conf_ca_chain(&tls->conf, &tls->ca, &tls->crl);
+#endif
+    if (opts->srvname.len > 0) {
+      char mem[128], *buf = mem;
+      mg_asprintf(&buf, sizeof(mem), "%.*s", (int) opts->srvname.len,
+                  opts->srvname.ptr);
+      mbedtls_ssl_set_hostname(&tls->ssl, buf);
+      if (buf != mem) free(buf);
+    }
+    mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_REQUIRED);
+  }
+  if (opts->cert != NULL && opts->cert[0] != '\0') {
+    struct mg_str s = mg_loadfile(fs, opts->cert);
+    const char *key = opts->certkey == NULL ? opts->cert : opts->certkey;
+    rc = mbedtls_x509_crt_parse(&tls->cert, (uint8_t *) s.ptr, s.len + 1);
+    if (opts->cert[0] != '-') free((char *) s.ptr);
+    if (rc != 0) {
+      mg_error(c, "parse(%s) err %#x", opts->cert, -rc);
+      goto fail;
+    }
+    s = mg_loadfile(fs, key);
+    rc = mbedtls_pk_parse_key(&tls->pk, (uint8_t *) s.ptr, s.len + 1, NULL,
+                              0 MGRNG);
+    if (key[0] != '-') free((char *) s.ptr);
+    if (rc != 0) {
+      mg_error(c, "tls key(%s) %#x", key, -rc);
+      goto fail;
+    }
+    rc = mbedtls_ssl_conf_own_cert(&tls->conf, &tls->cert, &tls->pk);
+    if (rc != 0) {
+      mg_error(c, "own cert %#x", -rc);
+      goto fail;
+    }
+  }
+  if ((rc = mbedtls_ssl_setup(&tls->ssl, &tls->conf)) != 0) {
+    mg_error(c, "setup err %#x", -rc);
+    goto fail;
+  }
+  c->tls = tls;
+  c->is_tls = 1;
+  c->is_tls_hs = 1;
+  if (c->is_client && c->is_resolving == 0 && c->is_connecting == 0) {
+    mg_tls_handshake(c);
+  }
+  return;
+fail:
+  mg_tls_free(c);
+}
+
+long mg_tls_recv(struct mg_connection *c, void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  long n = mbedtls_ssl_read(&tls->ssl, (unsigned char *) buf, len);
+  return n == 0 ? -1 : n == MBEDTLS_ERR_SSL_WANT_READ ? 0 : n;
+}
+
+long mg_tls_send(struct mg_connection *c, const void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  long n = mbedtls_ssl_write(&tls->ssl, (unsigned char *) buf, len);
+  return n == 0 ? -1 : n == MBEDTLS_ERR_SSL_WANT_WRITE ? 0 : n;
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/tls_openssl.c"
+#endif
+
+
+#if MG_ENABLE_OPENSSL
+static int mg_tls_err(struct mg_tls *tls, int res) {
+  int err = SSL_get_error(tls->ssl, res);
+  // We've just fetched the last error from the queue.
+  // Now we need to clear the error queue. If we do not, then the following
+  // can happen (actually reported):
+  //  - A new connection is accept()-ed with cert error (e.g. self-signed cert)
+  //  - Since all accept()-ed connections share listener's context,
+  //  - *ALL* SSL accepted connection report read error on the next poll cycle.
+  //    Thus a single errored connection can close all the rest, unrelated ones.
+  // Clearing the error keeps the shared SSL_CTX in an OK state.
+
+  if (err != 0) ERR_print_errors_fp(stderr);
+  ERR_clear_error();
+  if (err == SSL_ERROR_WANT_READ) return 0;
+  if (err == SSL_ERROR_WANT_WRITE) return 0;
+  return err;
+}
+
+void mg_tls_init(struct mg_connection *c, struct mg_tls_opts *opts) {
+  struct mg_tls *tls = (struct mg_tls *) calloc(1, sizeof(*tls));
+  const char *id = "mongoose";
+  static unsigned char s_initialised = 0;
+  int rc;
+
+  if (tls == NULL) {
+    mg_error(c, "TLS OOM");
+    goto fail;
+  }
+
+  if (!s_initialised) {
+    SSL_library_init();
+    s_initialised++;
+  }
+  MG_DEBUG(("%lu Setting TLS, CA: %s, cert: %s, key: %s", c->id,
+            opts->ca == NULL ? "null" : opts->ca,
+            opts->cert == NULL ? "null" : opts->cert,
+            opts->certkey == NULL ? "null" : opts->certkey));
+  tls->ctx = c->is_client ? SSL_CTX_new(SSLv23_client_method())
+                          : SSL_CTX_new(SSLv23_server_method());
+  if ((tls->ssl = SSL_new(tls->ctx)) == NULL) {
+    mg_error(c, "SSL_new");
+    goto fail;
+  }
+  SSL_set_session_id_context(tls->ssl, (const uint8_t *) id,
+                             (unsigned) strlen(id));
+  // Disable deprecated protocols
+  SSL_set_options(tls->ssl, SSL_OP_NO_SSLv2);
+  SSL_set_options(tls->ssl, SSL_OP_NO_SSLv3);
+  SSL_set_options(tls->ssl, SSL_OP_NO_TLSv1);
+  SSL_set_options(tls->ssl, SSL_OP_NO_TLSv1_1);
+#ifdef MG_ENABLE_OPENSSL_NO_COMPRESSION
+  SSL_set_options(tls->ssl, SSL_OP_NO_COMPRESSION);
+#endif
+#ifdef MG_ENABLE_OPENSSL_CIPHER_SERVER_PREFERENCE
+  SSL_set_options(tls->ssl, SSL_OP_CIPHER_SERVER_PREFERENCE);
+#endif
+
+  if (opts->ca != NULL && opts->ca[0] != '\0') {
+    SSL_set_verify(tls->ssl, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
+                   NULL);
+    if ((rc = SSL_CTX_load_verify_locations(tls->ctx, opts->ca, NULL)) != 1) {
+      mg_error(c, "parse(%s): err %d", opts->ca, mg_tls_err(tls, rc));
+      goto fail;
+    }
+  }
+  if (opts->cert != NULL && opts->cert[0] != '\0') {
+    const char *key = opts->certkey;
+    if (key == NULL) key = opts->cert;
+    if ((rc = SSL_use_certificate_file(tls->ssl, opts->cert, 1)) != 1) {
+      mg_error(c, "Invalid SSL cert, err %d", mg_tls_err(tls, rc));
+      goto fail;
+    } else if ((rc = SSL_use_PrivateKey_file(tls->ssl, key, 1)) != 1) {
+      mg_error(c, "Invalid SSL key, err %d", mg_tls_err(tls, rc));
+      goto fail;
+#if OPENSSL_VERSION_NUMBER > 0x10100000L
+    } else if ((rc = SSL_use_certificate_chain_file(tls->ssl, opts->cert)) !=
+               1) {
+      mg_error(c, "Invalid CA, err %d", mg_tls_err(tls, rc));
+      goto fail;
+#endif
+    } else {
+      SSL_set_mode(tls->ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
+#if OPENSSL_VERSION_NUMBER > 0x10002000L
+      SSL_set_ecdh_auto(tls->ssl, 1);
+#endif
+    }
+  }
+  if (opts->ciphers != NULL) SSL_set_cipher_list(tls->ssl, opts->ciphers);
+  if (opts->srvname.len > 0) {
+    char mem[128], *buf = mem;
+    mg_asprintf(&buf, sizeof(mem), "%.*s", (int) opts->srvname.len,
+                opts->srvname.ptr);
+    SSL_set_tlsext_host_name(tls->ssl, buf);
+    if (buf != mem) free(buf);
+  }
+  c->tls = tls;
+  c->is_tls = 1;
+  c->is_tls_hs = 1;
+  if (c->is_client && c->is_resolving == 0 && c->is_connecting == 0) {
+    mg_tls_handshake(c);
+  }
+  MG_DEBUG(("%lu SSL %s OK", c->id, c->is_accepted ? "accept" : "client"));
+  return;
+fail:
+  c->is_closing = 1;
+  free(tls);
+}
+
+void mg_tls_handshake(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int rc;
+  SSL_set_fd(tls->ssl, (int) (size_t) c->fd);
+  rc = c->is_client ? SSL_connect(tls->ssl) : SSL_accept(tls->ssl);
+  if (rc == 1) {
+    MG_DEBUG(("%lu success", c->id));
+    c->is_tls_hs = 0;
+  } else {
+    int code = mg_tls_err(tls, rc);
+    if (code != 0) mg_error(c, "tls hs: rc %d, err %d", rc, code);
+  }
+}
+
+void mg_tls_free(struct mg_connection *c) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  if (tls == NULL) return;
+  SSL_free(tls->ssl);
+  SSL_CTX_free(tls->ctx);
+  free(tls);
+  c->tls = NULL;
+}
+
+long mg_tls_recv(struct mg_connection *c, void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int n = SSL_read(tls->ssl, buf, (int) len);
+  return n == 0 ? -1 : n < 0 && mg_tls_err(tls, n) == 0 ? 0 : n;
+}
+
+long mg_tls_send(struct mg_connection *c, const void *buf, size_t len) {
+  struct mg_tls *tls = (struct mg_tls *) c->tls;
+  int n = SSL_write(tls->ssl, buf, (int) len);
+  return n == 0 ? -1 : n < 0 && mg_tls_err(tls, n) == 0 ? 0 : n;
+}
+#endif
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/url.c"
+#endif
+
+#include <stdlib.h>
+
+struct url {
+  size_t key, user, pass, host, port, uri, end;
+};
+
+int mg_url_is_ssl(const char *url) {
+  return strncmp(url, "wss:", 4) == 0 || strncmp(url, "https:", 6) == 0 ||
+         strncmp(url, "mqtts:", 6) == 0 || strncmp(url, "ssl:", 4) == 0 ||
+         strncmp(url, "tls:", 4) == 0;
+}
+
+static struct url urlparse(const char *url) {
+  size_t i;
+  struct url u;
+  memset(&u, 0, sizeof(u));
+  for (i = 0; url[i] != '\0'; i++) {
+    if (i > 0 && u.host == 0 && url[i - 1] == '/' && url[i] == '/') {
+      u.host = i + 1;
+      u.port = 0;
+    } else if (url[i] == ']') {
+      u.port = 0;  // IPv6 URLs, like http://[::1]/bar
+    } else if (url[i] == ':' && u.port == 0 && u.uri == 0) {
+      u.port = i + 1;
+    } else if (url[i] == '@' && u.user == 0 && u.pass == 0) {
+      u.user = u.host;
+      u.pass = u.port;
+      u.host = i + 1;
+      u.port = 0;
+    } else if (u.host && u.uri == 0 && url[i] == '/') {
+      u.uri = i;
+    }
+  }
+  u.end = i;
+#if 0
+  printf("[%s] %d %d %d %d %d\n", url, u.user, u.pass, u.host, u.port, u.uri);
+#endif
+  return u;
+}
+
+struct mg_str mg_url_host(const char *url) {
+  struct url u = urlparse(url);
+  size_t n = u.port  ? u.port - u.host - 1
+             : u.uri ? u.uri - u.host
+                     : u.end - u.host;
+  struct mg_str s = mg_str_n(url + u.host, n);
+  return s;
+}
+
+const char *mg_url_uri(const char *url) {
+  struct url u = urlparse(url);
+  return u.uri ? url + u.uri : "/";
+}
+
+unsigned short mg_url_port(const char *url) {
+  struct url u = urlparse(url);
+  unsigned short port = 0;
+  if (strncmp(url, "http:", 5) == 0 || strncmp(url, "ws:", 3) == 0) port = 80;
+  if (strncmp(url, "wss:", 4) == 0 || strncmp(url, "https:", 6) == 0)
+    port = 443;
+  if (strncmp(url, "mqtt:", 5) == 0) port = 1883;
+  if (strncmp(url, "mqtts:", 6) == 0) port = 8883;
+  if (u.port) port = (unsigned short) atoi(url + u.port);
+  return port;
+}
+
+struct mg_str mg_url_user(const char *url) {
+  struct url u = urlparse(url);
+  struct mg_str s = mg_str("");
+  if (u.user && (u.pass || u.host)) {
+    size_t n = u.pass ? u.pass - u.user - 1 : u.host - u.user - 1;
+    s = mg_str_n(url + u.user, n);
+  }
+  return s;
+}
+
+struct mg_str mg_url_pass(const char *url) {
+  struct url u = urlparse(url);
+  struct mg_str s = mg_str_n("", 0UL);
+  if (u.pass && u.host) {
+    size_t n = u.host - u.pass - 1;
+    s = mg_str_n(url + u.pass, n);
+  }
+  return s;
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/util.c"
+#endif
+
+
+#if MG_ARCH == MG_ARCH_UNIX && defined(__APPLE__)
+#include <mach/mach_time.h>
+#endif
+
+#if MG_ENABLE_CUSTOM_RANDOM
+#else
+void mg_random(void *buf, size_t len) {
+  bool done = false;
+  unsigned char *p = (unsigned char *) buf;
+#if MG_ARCH == MG_ARCH_ESP32
+  while (len--) *p++ = (unsigned char) (esp_random() & 255);
+  done = true;
+#elif MG_ARCH == MG_ARCH_WIN32
+#elif MG_ARCH == MG_ARCH_UNIX
+  FILE *fp = fopen("/dev/urandom", "rb");
+  if (fp != NULL) {
+    if (fread(buf, 1, len, fp) == len) done = true;
+    fclose(fp);
+  }
+#endif
+  // If everything above did not work, fallback to a pseudo random generator
+  while (!done && len--) *p++ = (unsigned char) (rand() & 255);
+}
+#endif
+
+uint32_t mg_ntohl(uint32_t net) {
+  uint8_t data[4] = {0, 0, 0, 0};
+  memcpy(&data, &net, sizeof(data));
+  return (((uint32_t) data[3]) << 0) | (((uint32_t) data[2]) << 8) |
+         (((uint32_t) data[1]) << 16) | (((uint32_t) data[0]) << 24);
+}
+
+uint16_t mg_ntohs(uint16_t net) {
+  uint8_t data[2] = {0, 0};
+  memcpy(&data, &net, sizeof(data));
+  return (uint16_t) ((uint16_t) data[1] | (((uint16_t) data[0]) << 8));
+}
+
+uint32_t mg_crc32(uint32_t crc, const char *buf, size_t len) {
+  int i;
+  crc = ~crc;
+  while (len--) {
+    crc ^= *(unsigned char *) buf++;
+    for (i = 0; i < 8; i++) crc = crc & 1 ? (crc >> 1) ^ 0xedb88320 : crc >> 1;
+  }
+  return ~crc;
+}
+
+static int isbyte(int n) {
+  return n >= 0 && n <= 255;
+}
+
+static int parse_net(const char *spec, uint32_t *net, uint32_t *mask) {
+  int n, a, b, c, d, slash = 32, len = 0;
+  if ((sscanf(spec, "%d.%d.%d.%d/%d%n", &a, &b, &c, &d, &slash, &n) == 5 ||
+       sscanf(spec, "%d.%d.%d.%d%n", &a, &b, &c, &d, &n) == 4) &&
+      isbyte(a) && isbyte(b) && isbyte(c) && isbyte(d) && slash >= 0 &&
+      slash < 33) {
+    len = n;
+    *net = ((uint32_t) a << 24) | ((uint32_t) b << 16) | ((uint32_t) c << 8) |
+           (uint32_t) d;
+    *mask = slash ? (uint32_t) (0xffffffffU << (32 - slash)) : (uint32_t) 0;
+  }
+  return len;
+}
+
+int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip) {
+  struct mg_str k, v;
+  int allowed = acl.len == 0 ? '+' : '-';  // If any ACL is set, deny by default
+  while (mg_commalist(&acl, &k, &v)) {
+    uint32_t net, mask;
+    if (k.ptr[0] != '+' && k.ptr[0] != '-') return -1;
+    if (parse_net(&k.ptr[1], &net, &mask) == 0) return -2;
+    if ((mg_ntohl(remote_ip) & mask) == net) allowed = k.ptr[0];
+  }
+  return allowed == '+';
+}
+
+int64_t mg_millis(void) {
+#if MG_ARCH == MG_ARCH_WIN32
+  return GetTickCount();
+#elif MG_ARCH == MG_ARCH_ESP32
+  return esp_timer_get_time() / 1000;
+#elif MG_ARCH == MG_ARCH_ESP8266
+  return xTaskGetTickCount() * portTICK_PERIOD_MS;
+#elif MG_ARCH == MG_ARCH_FREERTOS_TCP || MG_ARCH == MG_ARCH_FREERTOS_LWIP
+  return xTaskGetTickCount() * portTICK_PERIOD_MS;
+#elif MG_ARCH == MG_ARCH_AZURERTOS
+  return tx_time_get() * (1000 /* MS per SEC */ / TX_TIMER_TICKS_PER_SECOND);
+#elif MG_ARCH == MG_ARCH_UNIX && defined(__APPLE__)
+  uint64_t ticks = mach_absolute_time();
+  static mach_timebase_info_data_t timebase;
+  mach_timebase_info(&timebase);
+  double ticks_to_nanos = (double) timebase.numer / timebase.denom;
+  uint64_t uptime_nanos = (uint64_t) (ticks_to_nanos * ticks);
+  return (int64_t) (uptime_nanos / 1000000);
+#elif MG_ARCH == MG_ARCH_UNIX
+  struct timespec ts;
+#ifdef _POSIX_MONOTONIC_CLOCK
+#ifdef CLOCK_MONOTONIC_RAW
+  clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
+#else
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+#endif
+#else
+  clock_gettime(CLOCK_REALTIME, &ts);
+#endif
+  return ((int64_t) ts.tv_sec * 1000 + (int64_t) ts.tv_nsec / 1000000);
+#else
+  return time(NULL) * 1000;
+#endif
+}
+
+#ifdef MG_ENABLE_LINES
+#line 1 "src/ws.c"
+#endif
+
+
+
+
+
+
+
+
+
+struct ws_msg {
+  uint8_t flags;
+  size_t header_len;
+  size_t data_len;
+};
+
+static void ws_handshake(struct mg_connection *c, const struct mg_str *wskey,
+                         const struct mg_str *wsproto, const char *fmt,
+                         va_list ap) {
+  const char *magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
+  unsigned char sha[20], b64_sha[30];
+  char mem[128], *buf = mem;
+
+  mg_sha1_ctx sha_ctx;
+  mg_sha1_init(&sha_ctx);
+  mg_sha1_update(&sha_ctx, (unsigned char *) wskey->ptr, wskey->len);
+  mg_sha1_update(&sha_ctx, (unsigned char *) magic, 36);
+  mg_sha1_final(sha, &sha_ctx);
+  mg_base64_encode(sha, sizeof(sha), (char *) b64_sha);
+  buf[0] = '\0';
+  if (fmt != NULL) mg_vasprintf(&buf, sizeof(mem), fmt, ap);
+  mg_printf(c,
+            "HTTP/1.1 101 Switching Protocols\r\n"
+            "Upgrade: websocket\r\n"
+            "Connection: Upgrade\r\n"
+            "Sec-WebSocket-Accept: %s\r\n"
+            "%s",
+            b64_sha, buf);
+  if (buf != mem) free(buf);
+  if (wsproto != NULL) {
+    mg_printf(c, "Sec-WebSocket-Protocol: %.*s\r\n", (int) wsproto->len,
+              wsproto->ptr);
+  }
+  mg_send(c, "\r\n", 2);
+}
+
+static size_t ws_process(uint8_t *buf, size_t len, struct ws_msg *msg) {
+  size_t i, n = 0, mask_len = 0;
+  memset(msg, 0, sizeof(*msg));
+  if (len >= 2) {
+    n = buf[1] & 0x7f;                // Frame length
+    mask_len = buf[1] & 128 ? 4 : 0;  // last bit is a mask bit
+    msg->flags = buf[0];
+    if (n < 126 && len >= mask_len) {
+      msg->data_len = n;
+      msg->header_len = 2 + mask_len;
+    } else if (n == 126 && len >= 4 + mask_len) {
+      msg->header_len = 4 + mask_len;
+      msg->data_len = mg_ntohs(*(uint16_t *) &buf[2]);
+    } else if (len >= 10 + mask_len) {
+      msg->header_len = 10 + mask_len;
+      msg->data_len =
+          (size_t) (((uint64_t) mg_ntohl(*(uint32_t *) &buf[2])) << 32) +
+          mg_ntohl(*(uint32_t *) &buf[6]);
+    }
+  }
+  // Sanity check, and integer overflow protection for the boundary check below
+  // data_len should not be larger than 1 Gb
+  if (msg->data_len > 1024 * 1024 * 1024) return 0;
+  if (msg->header_len + msg->data_len > len) return 0;
+  if (mask_len > 0) {
+    uint8_t *p = buf + msg->header_len, *m = p - mask_len;
+    for (i = 0; i < msg->data_len; i++) p[i] ^= m[i & 3];
+  }
+  return msg->header_len + msg->data_len;
+}
+
+static size_t mkhdr(size_t len, int op, bool is_client, uint8_t *buf) {
+  size_t n = 0;
+  buf[0] = (uint8_t) (op | 128);
+  if (len < 126) {
+    buf[1] = (unsigned char) len;
+    n = 2;
+  } else if (len < 65536) {
+    uint16_t tmp = mg_htons((uint16_t) len);
+    buf[1] = 126;
+    memcpy(&buf[2], &tmp, sizeof(tmp));
+    n = 4;
+  } else {
+    uint32_t tmp;
+    buf[1] = 127;
+    tmp = mg_htonl((uint32_t) ((uint64_t) len >> 32));
+    memcpy(&buf[2], &tmp, sizeof(tmp));
+    tmp = mg_htonl((uint32_t) (len & 0xffffffff));
+    memcpy(&buf[6], &tmp, sizeof(tmp));
+    n = 10;
+  }
+  if (is_client) {
+    buf[1] |= 1 << 7;  // Set masking flag
+    mg_random(&buf[n], 4);
+    n += 4;
+  }
+  return n;
+}
+
+static void mg_ws_mask(struct mg_connection *c, size_t len) {
+  if (c->is_client && c->send.buf != NULL) {
+    size_t i;
+    uint8_t *p = c->send.buf + c->send.len - len, *mask = p - 4;
+    for (i = 0; i < len; i++) p[i] ^= mask[i & 3];
+  }
+}
+
+size_t mg_ws_send(struct mg_connection *c, const char *buf, size_t len,
+                  int op) {
+  uint8_t header[14];
+  size_t header_len = mkhdr(len, op, c->is_client, header);
+  mg_send(c, header, header_len);
+  MG_VERBOSE(("WS out: %d [%.*s]", (int) len, (int) len, buf));
+  mg_send(c, buf, len);
+  mg_ws_mask(c, len);
+  return header_len + len;
+}
+
+static void mg_ws_cb(struct mg_connection *c, int ev, void *ev_data,
+                     void *fn_data) {
+  struct ws_msg msg;
+  size_t ofs = (size_t) c->pfn_data;
+
+  // assert(ofs < c->recv.len);
+  if (ev == MG_EV_READ) {
+    if (!c->is_websocket && c->is_client) {
+      int n = mg_http_get_request_len(c->recv.buf, c->recv.len);
+      if (n < 0) {
+        c->is_closing = 1;  // Some just, not an HTTP request
+      } else if (n > 0) {
+        if (n < 15 || memcmp(c->recv.buf + 9, "101", 3) != 0) {
+          MG_ERROR(("%lu WS handshake error: %.*s", c->id, 15, c->recv.buf));
+          c->is_closing = 1;
+        } else {
+          struct mg_http_message hm;
+          mg_http_parse((char *) c->recv.buf, c->recv.len, &hm);
+          c->is_websocket = 1;
+          mg_call(c, MG_EV_WS_OPEN, &hm);
+        }
+        mg_iobuf_del(&c->recv, 0, (size_t) n);
+      } else {
+        return;  // A request is not yet received
+      }
+    }
+
+    while (ws_process(c->recv.buf + ofs, c->recv.len - ofs, &msg) > 0) {
+      char *s = (char *) c->recv.buf + ofs + msg.header_len;
+      struct mg_ws_message m = {{s, msg.data_len}, msg.flags};
+      size_t len = msg.header_len + msg.data_len;
+      uint8_t final = msg.flags & 128, op = msg.flags & 15;
+      // MG_VERBOSE ("fin %d op %d len %d [%.*s]", final, op,
+      //                       (int) m.data.len, (int) m.data.len, m.data.ptr));
+      switch (op) {
+        case WEBSOCKET_OP_CONTINUE:
+          mg_call(c, MG_EV_WS_CTL, &m);
+          break;
+        case WEBSOCKET_OP_PING:
+          MG_DEBUG(("%s", "WS PONG"));
+          mg_ws_send(c, s, msg.data_len, WEBSOCKET_OP_PONG);
+          mg_call(c, MG_EV_WS_CTL, &m);
+          break;
+        case WEBSOCKET_OP_PONG:
+          mg_call(c, MG_EV_WS_CTL, &m);
+          break;
+        case WEBSOCKET_OP_TEXT:
+        case WEBSOCKET_OP_BINARY:
+          if (final) mg_call(c, MG_EV_WS_MSG, &m);
+          break;
+        case WEBSOCKET_OP_CLOSE:
+          MG_DEBUG(("%lu Got WS CLOSE", c->id));
+          mg_call(c, MG_EV_WS_CTL, &m);
+          c->is_closing = 1;
+          break;
+        default:
+          // Per RFC6455, close conn when an unknown op is recvd
+          mg_error(c, "unknown WS op %d", op);
+          break;
+      }
+
+      // Handle fragmented frames: strip header, keep in c->recv
+      if (final == 0 || op == 0) {
+        if (op) ofs++, len--, msg.header_len--;       // First frame
+        mg_iobuf_del(&c->recv, ofs, msg.header_len);  // Strip header
+        len -= msg.header_len;
+        ofs += len;
+        c->pfn_data = (void *) ofs;
+        // MG_INFO(("FRAG %d [%.*s]", (int) ofs, (int) ofs, c->recv.buf));
+      }
+      // Remove non-fragmented frame
+      if (final && op) mg_iobuf_del(&c->recv, ofs, len);
+      // Last chunk of the fragmented frame
+      if (final && !op) {
+        m.flags = c->recv.buf[0];
+        m.data = mg_str_n((char *) &c->recv.buf[1], (size_t) (ofs - 1));
+        mg_call(c, MG_EV_WS_MSG, &m);
+        mg_iobuf_del(&c->recv, 0, ofs);
+        ofs = 0;
+        c->pfn_data = NULL;
+      }
+    }
+  }
+  (void) fn_data;
+  (void) ev_data;
+}
+
+struct mg_connection *mg_ws_connect(struct mg_mgr *mgr, const char *url,
+                                    mg_event_handler_t fn, void *fn_data,
+                                    const char *fmt, ...) {
+  struct mg_connection *c = mg_connect(mgr, url, fn, fn_data);
+  if (c != NULL) {
+    char nonce[16], key[30], mem1[128], mem2[256], *buf1 = mem1, *buf2 = mem2;
+    struct mg_str host = mg_url_host(url);
+    size_t n1 = 0, n2 = 0;
+    if (fmt != NULL) {
+      va_list ap;
+      va_start(ap, fmt);
+      n1 = mg_vasprintf(&buf1, sizeof(mem1), fmt, ap);
+      va_end(ap);
+    }
+    // Send handshake request
+    // mg_url_host(url, host, sizeof(host));
+    mg_random(nonce, sizeof(nonce));
+    mg_base64_encode((unsigned char *) nonce, sizeof(nonce), key);
+    n2 = mg_asprintf(&buf2, sizeof(mem2),
+                     "GET %s HTTP/1.1\r\n"
+                     "Upgrade: websocket\r\n"
+                     "Host: %.*s\r\n"
+                     "Connection: Upgrade\r\n"
+                     "%.*s"
+                     "Sec-WebSocket-Version: 13\r\n"
+                     "Sec-WebSocket-Key: %s\r\n"
+                     "\r\n",
+                     mg_url_uri(url), (int) host.len, host.ptr, n1, buf1, key);
+    mg_send(c, buf2, n2 > 0 ? n2 : 0);
+    if (buf1 != mem1) free(buf1);
+    if (buf2 != mem2) free(buf2);
+    c->pfn = mg_ws_cb;
+    c->pfn_data = NULL;
+  }
+  return c;
+}
+
+void mg_ws_upgrade(struct mg_connection *c, struct mg_http_message *hm,
+                   const char *fmt, ...) {
+  struct mg_str *wskey = mg_http_get_header(hm, "Sec-WebSocket-Key");
+  c->pfn = mg_ws_cb;
+  c->pfn_data = NULL;
+  if (wskey == NULL) {
+    mg_http_reply(c, 426, "", "WS upgrade expected\n");
+    c->is_draining = 1;
+  } else {
+    struct mg_str *wsproto = mg_http_get_header(hm, "Sec-WebSocket-Protocol");
+    va_list ap;
+    va_start(ap, fmt);
+    ws_handshake(c, wskey, wsproto, fmt, ap);
+    va_end(ap);
+    c->is_websocket = 1;
+    mg_call(c, MG_EV_WS_OPEN, hm);
+  }
+}
+
+size_t mg_ws_wrap(struct mg_connection *c, size_t len, int op) {
+  uint8_t header[14], *p;
+  size_t header_len = mkhdr(len, op, c->is_client, header);
+
+  // NOTE: order of operations is important!
+  mg_iobuf_add(&c->send, c->send.len, NULL, header_len, MG_IO_SIZE);
+  p = &c->send.buf[c->send.len - len];         // p points to data
+  memmove(p, p - header_len, len);             // Shift data
+  memcpy(p - header_len, header, header_len);  // Prepend header
+  mg_ws_mask(c, len);                          // Mask data
+
+  return c->send.len;
+}
diff --git a/mongoose.h b/mongoose.h
new file mode 100644
index 0000000..b2a658d
--- /dev/null
+++ b/mongoose.h
@@ -0,0 +1,1142 @@
+// Copyright (c) 2004-2013 Sergey Lyubka
+// Copyright (c) 2013-2021 Cesanta Software Limited
+// All rights reserved
+//
+// This software is dual-licensed: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation. For the terms of this
+// license, see http://www.gnu.org/licenses/
+//
+// You are free to use this software under the terms of the GNU General
+// Public License, but WITHOUT ANY WARRANTY; without even the implied
+// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU General Public License for more details.
+//
+// Alternatively, you can license this software under a commercial
+// license, as set out in https://www.mongoose.ws/licensing/
+
+#ifndef MONGOOSE_H
+#define MONGOOSE_H
+
+#define MG_VERSION "7.6"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#define MG_ARCH_CUSTOM 0
+#define MG_ARCH_UNIX 1
+#define MG_ARCH_WIN32 2
+#define MG_ARCH_ESP32 3
+#define MG_ARCH_ESP8266 4
+#define MG_ARCH_FREERTOS_TCP 5
+#define MG_ARCH_FREERTOS_LWIP 6
+#define MG_ARCH_AZURERTOS 7
+
+#if !defined(MG_ARCH)
+#if defined(__unix__) || defined(__APPLE__)
+#define MG_ARCH MG_ARCH_UNIX
+#elif defined(_WIN32)
+#define MG_ARCH MG_ARCH_WIN32
+#elif defined(ICACHE_FLASH) || defined(ICACHE_RAM_ATTR)
+#define MG_ARCH MG_ARCH_ESP8266
+#elif defined(ESP_PLATFORM)
+#define MG_ARCH MG_ARCH_ESP32
+#elif defined(FREERTOS_IP_H)
+#define MG_ARCH MG_ARCH_FREERTOS_TCP
+#elif defined(AZURE_RTOS_THREADX)
+#define MG_ARCH MG_ARCH_AZURERTOS
+#endif
+
+#if !defined(MG_ARCH)
+#error "MG_ARCH is not specified and we couldn't guess it."
+#endif
+#endif  // !defined(MG_ARCH)
+
+#if defined(__GNUC__) && defined(__arm__)
+#define PRINTF_LIKE(f, a) __attribute__((format(printf, f, a)))
+#else
+#define PRINTF_LIKE(f, a)
+#endif
+
+#if MG_ARCH == MG_ARCH_CUSTOM
+#include <mongoose_custom.h>
+#endif
+
+
+
+
+
+
+
+
+
+#if MG_ARCH == MG_ARCH_AZURERTOS
+
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <time.h>
+
+#include <fx_api.h>
+#include <tx_api.h>
+
+#include <nx_api.h>
+#include <nx_bsd.h>
+#include <nx_port.h>
+#include <tx_port.h>
+
+#ifdef __REDLIB__
+#define va_copy(d, s) __builtin_va_copy(d, s)
+#endif
+
+#define PATH_MAX FX_MAXIMUM_PATH
+#define MG_DIRSEP '\\'
+
+#define socklen_t int
+#define closesocket(x) soc_close(x)
+
+#undef FOPEN_MAX
+
+#endif
+
+
+#if MG_ARCH == MG_ARCH_ESP32
+
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <netdb.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+
+#define MG_PATH_MAX 128
+#define MG_ENABLE_DIRLIST 1
+
+#endif
+
+
+#if MG_ARCH == MG_ARCH_ESP8266
+
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <netdb.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <time.h>
+
+#include <esp_system.h>
+
+#define MG_PATH_MAX 128
+#define MG_ENABLE_DIRLIST 1
+
+#endif
+
+
+#if MG_ARCH == MG_ARCH_FREERTOS_LWIP
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+#if defined(__GNUC__)
+#include <sys/stat.h>
+#include <sys/time.h>
+#else
+struct timeval {
+  time_t tv_sec;
+  long tv_usec;
+};
+#endif
+
+#include <FreeRTOS.h>
+#include <task.h>
+
+#include <lwip/sockets.h>
+
+#if LWIP_SOCKET != 1
+// Sockets support disabled in LWIP by default
+#error Set LWIP_SOCKET variable to 1 (in lwipopts.h)
+#endif
+
+// Re-route calloc/free to the FreeRTOS's functions, don't use stdlib
+static inline void *mg_calloc(int cnt, size_t size) {
+  void *p = pvPortMalloc(cnt * size);
+  if (p != NULL) memset(p, 0, size);
+  return p;
+}
+#define calloc(a, b) mg_calloc((a), (b))
+#define free(a) vPortFree(a)
+#define malloc(a) pvPortMalloc(a)
+#define mkdir(a, b) (-1)
+
+#ifndef MG_IO_SIZE
+#define MG_IO_SIZE 512
+#endif
+
+#ifndef MG_PATH_MAX
+#define MG_PATH_MAX 128
+#endif
+
+#endif  // MG_ARCH == MG_ARCH_FREERTOS_LWIP
+
+
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <time.h>
+
+#include <FreeRTOS.h>
+#include <FreeRTOS_IP.h>
+#include <FreeRTOS_Sockets.h>
+#include <task.h>
+
+// Why FreeRTOS-TCP did not implement a clean BSD API, but its own thing
+// with FreeRTOS_ prefix, is beyond me
+#define IPPROTO_TCP FREERTOS_IPPROTO_TCP
+#define IPPROTO_UDP FREERTOS_IPPROTO_UDP
+#define AF_INET FREERTOS_AF_INET
+#define SOCK_STREAM FREERTOS_SOCK_STREAM
+#define SOCK_DGRAM FREERTOS_SOCK_DGRAM
+#define SO_BROADCAST 0
+#define SO_ERROR 0
+#define SOL_SOCKET 0
+#define SO_REUSEADDR 0
+#define sockaddr_in freertos_sockaddr
+#define sockaddr freertos_sockaddr
+#define accept(a, b, c) FreeRTOS_accept((a), (b), (c))
+#define connect(a, b, c) FreeRTOS_connect((a), (b), (c))
+#define bind(a, b, c) FreeRTOS_bind((a), (b), (c))
+#define listen(a, b) FreeRTOS_listen((a), (b))
+#define socket(a, b, c) FreeRTOS_socket((a), (b), (c))
+#define send(a, b, c, d) FreeRTOS_send((a), (b), (c), (d))
+#define recv(a, b, c, d) FreeRTOS_recv((a), (b), (c), (d))
+#define setsockopt(a, b, c, d, e) FreeRTOS_setsockopt((a), (b), (c), (d), (e))
+#define sendto(a, b, c, d, e, f) FreeRTOS_sendto((a), (b), (c), (d), (e), (f))
+#define recvfrom(a, b, c, d, e, f) \
+  FreeRTOS_recvfrom((a), (b), (c), (d), (e), (f))
+#define closesocket(x) FreeRTOS_closesocket(x)
+#define gethostbyname(x) FreeRTOS_gethostbyname(x)
+#define getsockname(a, b, c) (-1)
+
+// Re-route calloc/free to the FreeRTOS's functions, don't use stdlib
+static inline void *mg_calloc(int cnt, size_t size) {
+  void *p = pvPortMalloc(cnt * size);
+  if (p != NULL) memset(p, 0, size);
+  return p;
+}
+#define calloc(a, b) mg_calloc((a), (b))
+#define free(a) vPortFree(a)
+#define malloc(a) pvPortMalloc(a)
+#define mkdir(a, b) (-1)
+
+#if !defined(__GNUC__)
+// copied from GCC on ARM; for some reason useconds are signed
+struct timeval {
+  time_t tv_sec;
+  long tv_usec;
+};
+#endif
+
+#ifndef EINPROGRESS
+#define EINPROGRESS pdFREERTOS_ERRNO_EINPROGRESS
+#endif
+#ifndef EWOULDBLOCK
+#define EWOULDBLOCK pdFREERTOS_ERRNO_EWOULDBLOCK
+#endif
+#ifndef EAGAIN
+#define EAGAIN pdFREERTOS_ERRNO_EAGAIN
+#endif
+#ifndef EINTR
+#define EINTR pdFREERTOS_ERRNO_EINTR
+#endif
+
+#endif  // MG_ARCH == MG_ARCH_FREERTOS_TCP
+
+
+#if MG_ARCH == MG_ARCH_UNIX
+
+#define _DARWIN_UNLIMITED_SELECT 1  // No limit on file descriptors
+
+#include <arpa/inet.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/select.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#ifndef MG_ENABLE_DIRLIST
+#define MG_ENABLE_DIRLIST 1
+#endif
+
+#endif
+
+
+#if MG_ARCH == MG_ARCH_WIN32
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+
+#ifndef _CRT_SECURE_NO_WARNINGS
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#ifndef _WINSOCK_DEPRECATED_NO_WARNINGS
+#define _WINSOCK_DEPRECATED_NO_WARNINGS
+#endif
+
+#include <ctype.h>
+#include <direct.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+
+#if defined(_MSC_VER) && _MSC_VER < 1700
+#define __func__ ""
+typedef __int64 int64_t;
+typedef unsigned __int64 uint64_t;
+typedef unsigned char uint8_t;
+typedef char int8_t;
+typedef unsigned short uint16_t;
+typedef short int16_t;
+typedef unsigned int uint32_t;
+typedef int int32_t;
+typedef enum { false = 0, true = 1 } bool;
+#else
+#include <stdbool.h>
+#include <stdint.h>
+#include <ws2tcpip.h>
+#endif
+
+#include <process.h>
+#include <winsock2.h>
+
+// Protect from calls like std::snprintf in app code
+// See https://github.com/cesanta/mongoose/issues/1047
+#ifndef __cplusplus
+#define snprintf _snprintf
+#define vsnprintf _vsnprintf
+#ifndef strdup  // For MSVC with _DEBUG, see #1359
+#define strdup(x) _strdup(x)
+#endif
+#endif
+
+typedef int socklen_t;
+#define MG_DIRSEP '\\'
+#ifndef PATH_MAX
+#define PATH_MAX MAX_PATH
+#endif
+#ifndef EINPROGRESS
+#define EINPROGRESS WSAEINPROGRESS
+#endif
+#ifndef EWOULDBLOCK
+#define EWOULDBLOCK WSAEWOULDBLOCK
+#endif
+
+#define realpath(a, b) _fullpath((b), (a), MG_PATH_MAX)
+#define sleep(x) Sleep(x)
+#define mkdir(a, b) _mkdir(a)
+
+#ifndef va_copy
+#ifdef __va_copy
+#define va_copy __va_copy
+#else
+#define va_copy(x, y) (x) = (y)
+#endif
+#endif
+#ifndef S_ISDIR
+#define S_ISDIR(x) (((x) &_S_IFMT) == _S_IFDIR)
+#endif
+
+#ifndef MG_ENABLE_DIRLIST
+#define MG_ENABLE_DIRLIST 1
+#endif
+
+#endif
+
+
+#ifndef MG_ENABLE_FATFS
+#define MG_ENABLE_FATFS 0
+#endif
+
+#ifndef MG_FATFS_ROOT
+#define MG_FATFS_ROOT "/"
+#endif
+
+#ifndef MG_FATFS_BSIZE
+#define MG_FATFS_BSIZE 64
+#endif
+
+#ifndef MG_ENABLE_SOCKET
+#define MG_ENABLE_SOCKET 1
+#endif
+
+#ifndef MG_ENABLE_MBEDTLS
+#define MG_ENABLE_MBEDTLS 0
+#endif
+
+#ifndef MG_ENABLE_OPENSSL
+#define MG_ENABLE_OPENSSL 0
+#endif
+
+#ifndef MG_ENABLE_CUSTOM_TLS
+#define MG_ENABLE_CUSTOM_TLS 0
+#endif
+
+#ifndef MG_ENABLE_SSI
+#define MG_ENABLE_SSI 1
+#endif
+
+#ifndef MG_ENABLE_IPV6
+#define MG_ENABLE_IPV6 0
+#endif
+
+#ifndef MG_ENABLE_LOG
+#define MG_ENABLE_LOG 1
+#endif
+
+#ifndef MG_ENABLE_MD5
+#define MG_ENABLE_MD5 0
+#endif
+
+// Set MG_ENABLE_WINSOCK=0 for Win32 builds with external IP stack (like LWIP)
+#ifndef MG_ENABLE_WINSOCK
+#define MG_ENABLE_WINSOCK 1
+#endif
+
+#ifndef MG_ENABLE_DIRLIST
+#define MG_ENABLE_DIRLIST 0
+#endif
+
+#ifndef MG_ENABLE_CUSTOM_RANDOM
+#define MG_ENABLE_CUSTOM_RANDOM 0
+#endif
+
+#ifndef MG_ENABLE_PACKED_FS
+#define MG_ENABLE_PACKED_FS 0
+#endif
+
+// Granularity of the send/recv IO buffer growth
+#ifndef MG_IO_SIZE
+#define MG_IO_SIZE 2048
+#endif
+
+// Maximum size of the recv IO buffer
+#ifndef MG_MAX_RECV_BUF_SIZE
+#define MG_MAX_RECV_BUF_SIZE (3 * 1024 * 1024)
+#endif
+
+#ifndef MG_MAX_HTTP_HEADERS
+#define MG_MAX_HTTP_HEADERS 40
+#endif
+
+#ifndef MG_HTTP_INDEX
+#define MG_HTTP_INDEX "index.html"
+#endif
+
+#ifndef MG_PATH_MAX
+#ifdef PATH_MAX
+#define MG_PATH_MAX PATH_MAX
+#else
+#define MG_PATH_MAX 128
+#endif
+#endif
+
+#ifndef MG_SOCK_LISTEN_BACKLOG_SIZE
+#define MG_SOCK_LISTEN_BACKLOG_SIZE 128
+#endif
+
+#ifndef MG_DIRSEP
+#define MG_DIRSEP '/'
+#endif
+
+#ifndef MG_ENABLE_FILE
+#if defined(FOPEN_MAX)
+#define MG_ENABLE_FILE 1
+#else
+#define MG_ENABLE_FILE 0
+#endif
+#endif
+
+
+
+
+struct mg_str {
+  const char *ptr;  // Pointer to string data
+  size_t len;       // String len
+};
+
+#define MG_NULL_STR \
+  { NULL, 0 }
+
+#define MG_C_STR(a) \
+  { (a), sizeof(a) - 1 }
+
+// Using macro to avoid shadowing C++ struct constructor, see #1298
+#define mg_str(s) mg_str_s(s)
+
+struct mg_str mg_str(const char *s);
+struct mg_str mg_str_n(const char *s, size_t n);
+int mg_lower(const char *s);
+int mg_ncasecmp(const char *s1, const char *s2, size_t len);
+int mg_casecmp(const char *s1, const char *s2);
+int mg_vcmp(const struct mg_str *s1, const char *s2);
+int mg_vcasecmp(const struct mg_str *str1, const char *str2);
+int mg_strcmp(const struct mg_str str1, const struct mg_str str2);
+struct mg_str mg_strstrip(struct mg_str s);
+struct mg_str mg_strdup(const struct mg_str s);
+const char *mg_strstr(const struct mg_str haystack, const struct mg_str needle);
+bool mg_match(struct mg_str str, struct mg_str pattern, struct mg_str *caps);
+bool mg_globmatch(const char *pattern, size_t plen, const char *s, size_t n);
+bool mg_commalist(struct mg_str *s, struct mg_str *k, struct mg_str *v);
+bool mg_commalist(struct mg_str *s, struct mg_str *k, struct mg_str *v);
+size_t mg_vsnprintf(char *buf, size_t len, const char *fmt, va_list ap);
+size_t mg_snprintf(char *, size_t, const char *fmt, ...) PRINTF_LIKE(3, 4);
+char *mg_hexdump(const void *buf, size_t len);
+char *mg_hex(const void *buf, size_t len, char *dst);
+void mg_unhex(const char *buf, size_t len, unsigned char *to);
+unsigned long mg_unhexn(const char *s, size_t len);
+size_t mg_asprintf(char **, size_t, const char *fmt, ...) PRINTF_LIKE(3, 4);
+size_t mg_vasprintf(char **buf, size_t size, const char *fmt, va_list ap);
+int mg_check_ip_acl(struct mg_str acl, uint32_t remote_ip);
+int64_t mg_to64(struct mg_str str);
+
+
+
+
+
+enum { MG_LL_NONE, MG_LL_ERROR, MG_LL_INFO, MG_LL_DEBUG, MG_LL_VERBOSE };
+void mg_log(const char *fmt, ...) PRINTF_LIKE(1, 2);
+bool mg_log_prefix(int ll, const char *file, int line, const char *fname);
+void mg_log_set(const char *spec);
+void mg_log_set_callback(void (*fn)(const void *, size_t, void *), void *param);
+
+// Let the compiler always see the log invocation in order to check parameters
+// For MG_ENABLE_LOG=0 case, the call will be optimised out, anyway
+
+#if MG_ENABLE_LOG
+
+#define MG_LOG(level, args)                                                \
+  do {                                                                     \
+    if (mg_log_prefix((level), __FILE__, __LINE__, __func__)) mg_log args; \
+  } while (0)
+
+#else
+
+#define MG_LOG(level, args) \
+  do {                      \
+    (void) level;           \
+    if (0) mg_log args;     \
+  } while (0)
+
+#endif
+
+#define MG_ERROR(args) MG_LOG(MG_LL_ERROR, args)
+#define MG_INFO(args) MG_LOG(MG_LL_INFO, args)
+#define MG_DEBUG(args) MG_LOG(MG_LL_DEBUG, args)
+#define MG_VERBOSE(args) MG_LOG(MG_LL_VERBOSE, args)
+
+
+
+
+struct mg_timer {
+  int64_t period_ms;        // Timer period in milliseconds
+  int64_t expire;           // Expiration timestamp in milliseconds
+  unsigned flags;           // Possible flags values below
+#define MG_TIMER_REPEAT 1   // Call function periodically, otherwise run once
+#define MG_TIMER_RUN_NOW 2  // Call immediately when timer is set
+  void (*fn)(void *);       // Function to call
+  void *arg;                // Function argument
+  struct mg_timer *next;    // Linkage in g_timers list
+};
+
+extern struct mg_timer *g_timers;  // Global list of timers
+
+void mg_timer_init(struct mg_timer *, int64_t, unsigned, void (*)(void *),
+                   void *);
+void mg_timer_free(struct mg_timer *);
+void mg_timer_poll(int64_t current_time_ms);
+
+
+
+
+
+enum { MG_FS_READ = 1, MG_FS_WRITE = 2, MG_FS_DIR = 4 };
+
+// Filesystem API functions
+// st() returns MG_FS_* flags and populates file size and modification time
+// ls() calls fn() for every directory entry, allowing to list a directory
+//
+// NOTE: UNIX-style shorthand names for the API functions are deliberately
+// chosen to avoid conflicts with some libraries that make macros for e.g.
+// stat(), write(), read() calls.
+struct mg_fs {
+  int (*st)(const char *path, size_t *size, time_t *mtime);  // stat file
+  void (*ls)(const char *path, void (*fn)(const char *, void *), void *);
+  void *(*op)(const char *path, int flags);             // Open file
+  void (*cl)(void *fd);                                 // Close file
+  size_t (*rd)(void *fd, void *buf, size_t len);        // Read file
+  size_t (*wr)(void *fd, const void *buf, size_t len);  // Write file
+  size_t (*sk)(void *fd, size_t offset);                // Set file position
+  bool (*mv)(const char *from, const char *to);         // Rename file
+  bool (*rm)(const char *path);                         // Delete file
+  bool (*mkd)(const char *path);                        // Create directory
+};
+
+extern struct mg_fs mg_fs_posix;   // POSIX open/close/read/write/seek
+extern struct mg_fs mg_fs_packed;  // Packed FS, see examples/complete
+extern struct mg_fs mg_fs_fat;     // FAT FS
+
+// File descriptor
+struct mg_fd {
+  void *fd;
+  struct mg_fs *fs;
+};
+
+struct mg_fd *mg_fs_open(struct mg_fs *fs, const char *path, int flags);
+void mg_fs_close(struct mg_fd *fd);
+char *mg_file_read(struct mg_fs *fs, const char *path, size_t *size);
+bool mg_file_write(struct mg_fs *fs, const char *path, const void *, size_t);
+bool mg_file_printf(struct mg_fs *fs, const char *path, const char *fmt, ...);
+
+
+
+
+
+
+void mg_random(void *buf, size_t len);
+uint16_t mg_ntohs(uint16_t net);
+uint32_t mg_ntohl(uint32_t net);
+uint32_t mg_crc32(uint32_t crc, const char *buf, size_t len);
+int64_t mg_millis(void);
+
+#define mg_htons(x) mg_ntohs(x)
+#define mg_htonl(x) mg_ntohl(x)
+
+#ifndef EXTERN_C
+#ifdef __cplusplus
+#define EXTERN_C extern "C"
+#else
+#define EXTERN_C
+#endif
+#endif
+
+// Expands to a string representation of its argument: e.g.
+// MG_STRINGIFY_LITERAL(5) expands to "5"
+#if !defined(_MSC_VER) || _MSC_VER >= 1900
+#define MG_STRINGIFY_LITERAL(...) #__VA_ARGS__
+#else
+#define MG_STRINGIFY_LITERAL(x) #x
+#endif
+// Expands to a string representation of its argument, which can be a macro:
+// #define FOO 123
+// MG_STRINGIFY_MACRO(FOO)  // Expands to 123
+#define MG_STRINGIFY_MACRO(x) MG_STRINGIFY_LITERAL(x)
+
+// Linked list management macros
+#define LIST_ADD_HEAD(type_, head_, elem_) \
+  do {                                     \
+    (elem_)->next = (*head_);              \
+    *(head_) = (elem_);                    \
+  } while (0)
+
+#define LIST_ADD_TAIL(type_, head_, elem_) \
+  do {                                     \
+    type_ **h = head_;                     \
+    while (*h != NULL) h = &(*h)->next;    \
+    *h = (elem_);                          \
+  } while (0)
+
+#define LIST_DELETE(type_, head_, elem_)   \
+  do {                                     \
+    type_ **h = head_;                     \
+    while (*h != (elem_)) h = &(*h)->next; \
+    *h = (elem_)->next;                    \
+  } while (0)
+
+
+
+unsigned short mg_url_port(const char *url);
+int mg_url_is_ssl(const char *url);
+struct mg_str mg_url_host(const char *url);
+struct mg_str mg_url_user(const char *url);
+struct mg_str mg_url_pass(const char *url);
+const char *mg_url_uri(const char *url);
+
+
+#include <stddef.h>
+
+struct mg_iobuf {
+  unsigned char *buf;  // Pointer to stored data
+  size_t size;         // Total size available
+  size_t len;          // Current number of bytes
+};
+
+int mg_iobuf_init(struct mg_iobuf *, size_t);
+int mg_iobuf_resize(struct mg_iobuf *, size_t);
+void mg_iobuf_free(struct mg_iobuf *);
+size_t mg_iobuf_add(struct mg_iobuf *, size_t, const void *, size_t, size_t);
+size_t mg_iobuf_del(struct mg_iobuf *, size_t ofs, size_t len);
+
+int mg_base64_update(unsigned char p, char *to, int len);
+int mg_base64_final(char *to, int len);
+int mg_base64_encode(const unsigned char *p, int n, char *to);
+int mg_base64_decode(const char *src, int n, char *dst);
+
+
+
+
+typedef struct {
+  uint32_t buf[4];
+  uint32_t bits[2];
+  unsigned char in[64];
+} mg_md5_ctx;
+
+void mg_md5_init(mg_md5_ctx *c);
+void mg_md5_update(mg_md5_ctx *c, const unsigned char *data, size_t len);
+void mg_md5_final(mg_md5_ctx *c, unsigned char[16]);
+
+
+
+
+typedef struct {
+  uint32_t state[5];
+  uint32_t count[2];
+  unsigned char buffer[64];
+} mg_sha1_ctx;
+
+void mg_sha1_init(mg_sha1_ctx *);
+void mg_sha1_update(mg_sha1_ctx *, const unsigned char *data, size_t len);
+void mg_sha1_final(unsigned char digest[20], mg_sha1_ctx *);
+void mg_hmac_sha1(const unsigned char *key, size_t key_len,
+                  const unsigned char *text, size_t text_len,
+                  unsigned char out[20]);
+
+
+struct mg_connection;
+typedef void (*mg_event_handler_t)(struct mg_connection *, int ev,
+                                   void *ev_data, void *fn_data);
+void mg_call(struct mg_connection *c, int ev, void *ev_data);
+void mg_error(struct mg_connection *c, const char *fmt, ...);
+
+enum {
+  MG_EV_ERROR,       // Error                        char *error_message
+  MG_EV_OPEN,        // Connection created           NULL
+  MG_EV_POLL,        // mg_mgr_poll iteration        int64_t *milliseconds
+  MG_EV_RESOLVE,     // Host name is resolved        NULL
+  MG_EV_CONNECT,     // Connection established       NULL
+  MG_EV_ACCEPT,      // Connection accepted          NULL
+  MG_EV_READ,        // Data received from socket    struct mg_str *
+  MG_EV_WRITE,       // Data written to socket       long *bytes_written
+  MG_EV_CLOSE,       // Connection closed            NULL
+  MG_EV_HTTP_MSG,    // HTTP request/response        struct mg_http_message *
+  MG_EV_HTTP_CHUNK,  // HTTP chunk (partial msg)     struct mg_http_message *
+  MG_EV_WS_OPEN,     // Websocket handshake done     struct mg_http_message *
+  MG_EV_WS_MSG,      // Websocket msg, text or bin   struct mg_ws_message *
+  MG_EV_WS_CTL,      // Websocket control msg        struct mg_ws_message *
+  MG_EV_MQTT_CMD,    // MQTT low-level command       struct mg_mqtt_message *
+  MG_EV_MQTT_MSG,    // MQTT PUBLISH received        struct mg_mqtt_message *
+  MG_EV_MQTT_OPEN,   // MQTT CONNACK received        int *connack_status_code
+  MG_EV_SNTP_TIME,   // SNTP time received           int64_t *milliseconds
+  MG_EV_USER,        // Starting ID for user events
+};
+
+
+
+
+
+
+
+struct mg_dns {
+  const char *url;          // DNS server URL
+  struct mg_connection *c;  // DNS server connection
+};
+
+struct mg_addr {
+  uint16_t port;    // TCP or UDP port in network byte order
+  uint32_t ip;      // IP address in network byte order
+  uint8_t ip6[16];  // IPv6 address
+  bool is_ip6;      // True when address is IPv6 address
+};
+
+struct mg_mgr {
+  struct mg_connection *conns;  // List of active connections
+  struct mg_dns dns4;           // DNS for IPv4
+  struct mg_dns dns6;           // DNS for IPv6
+  int dnstimeout;               // DNS resolve timeout in milliseconds
+  unsigned long nextid;         // Next connection ID
+  void *userdata;               // Arbitrary user data pointer
+#if MG_ARCH == MG_ARCH_FREERTOS_TCP
+  SocketSet_t ss;  // NOTE(lsm): referenced from socket struct
+#endif
+};
+
+struct mg_connection {
+  struct mg_connection *next;  // Linkage in struct mg_mgr :: connections
+  struct mg_mgr *mgr;          // Our container
+  struct mg_addr peer;         // Remote address. For listeners, local address
+  void *fd;                    // Connected socket, or LWIP data
+  unsigned long id;            // Auto-incrementing unique connection ID
+  struct mg_iobuf recv;        // Incoming data
+  struct mg_iobuf send;        // Outgoing data
+  mg_event_handler_t fn;       // User-specified event handler function
+  void *fn_data;               // User-specified function parameter
+  mg_event_handler_t pfn;      // Protocol-specific handler function
+  void *pfn_data;              // Protocol-specific function parameter
+  char label[50];              // Arbitrary label
+  void *tls;                   // TLS specific data
+  unsigned is_listening : 1;   // Listening connection
+  unsigned is_client : 1;      // Outbound (client) connection
+  unsigned is_accepted : 1;    // Accepted (server) connection
+  unsigned is_resolving : 1;   // Non-blocking DNS resolution is in progress
+  unsigned is_connecting : 1;  // Non-blocking connect is in progress
+  unsigned is_tls : 1;         // TLS-enabled connection
+  unsigned is_tls_hs : 1;      // TLS handshake is in progress
+  unsigned is_udp : 1;         // UDP connection
+  unsigned is_websocket : 1;   // WebSocket connection
+  unsigned is_hexdumping : 1;  // Hexdump in/out traffic
+  unsigned is_draining : 1;    // Send remaining data, then close and free
+  unsigned is_closing : 1;     // Close and free the connection immediately
+  unsigned is_readable : 1;    // Connection is ready to read
+  unsigned is_writable : 1;    // Connection is ready to write
+};
+
+void mg_mgr_poll(struct mg_mgr *, int ms);
+void mg_mgr_init(struct mg_mgr *);
+void mg_mgr_free(struct mg_mgr *);
+
+struct mg_connection *mg_listen(struct mg_mgr *, const char *url,
+                                mg_event_handler_t fn, void *fn_data);
+struct mg_connection *mg_connect(struct mg_mgr *, const char *url,
+                                 mg_event_handler_t fn, void *fn_data);
+void mg_connect_resolved(struct mg_connection *);
+bool mg_send(struct mg_connection *, const void *, size_t);
+size_t mg_printf(struct mg_connection *, const char *fmt, ...);
+size_t mg_vprintf(struct mg_connection *, const char *fmt, va_list ap);
+char *mg_straddr(struct mg_addr *, char *, size_t);
+bool mg_aton(struct mg_str str, struct mg_addr *addr);
+char *mg_ntoa(const struct mg_addr *addr, char *buf, size_t len);
+
+struct mg_connection *mg_mkpipe(struct mg_mgr *, mg_event_handler_t, void *);
+void mg_mgr_wakeup(struct mg_connection *pipe, const void *buf, size_t len);
+
+
+
+
+
+
+
+
+struct mg_http_header {
+  struct mg_str name;   // Header name
+  struct mg_str value;  // Header value
+};
+
+struct mg_http_message {
+  struct mg_str method, uri, query, proto;             // Request/response line
+  struct mg_http_header headers[MG_MAX_HTTP_HEADERS];  // Headers
+  struct mg_str body;                                  // Body
+  struct mg_str head;                                  // Request + headers
+  struct mg_str chunk;    // Chunk for chunked encoding,  or partial body
+  struct mg_str message;  // Request + headers + body
+};
+
+// Parameter for mg_http_serve_dir()
+struct mg_http_serve_opts {
+  const char *root_dir;       // Web root directory, must be non-NULL
+  const char *ssi_pattern;    // SSI file name pattern, e.g. #.shtml
+  const char *extra_headers;  // Extra HTTP headers to add in responses
+  const char *mime_types;     // Extra mime types, ext1=type1,ext2=type2,..
+  struct mg_fs *fs;           // Filesystem implementation. Use NULL for POSIX
+};
+
+// Parameter for mg_http_next_multipart
+struct mg_http_part {
+  struct mg_str name;      // Form field name
+  struct mg_str filename;  // Filename for file uploads
+  struct mg_str body;      // Part contents
+};
+
+int mg_http_parse(const char *s, size_t len, struct mg_http_message *);
+int mg_http_get_request_len(const unsigned char *buf, size_t buf_len);
+void mg_http_printf_chunk(struct mg_connection *cnn, const char *fmt, ...);
+void mg_http_write_chunk(struct mg_connection *c, const char *buf, size_t len);
+void mg_http_delete_chunk(struct mg_connection *c, struct mg_http_message *hm);
+struct mg_connection *mg_http_listen(struct mg_mgr *, const char *url,
+                                     mg_event_handler_t fn, void *fn_data);
+struct mg_connection *mg_http_connect(struct mg_mgr *, const char *url,
+                                      mg_event_handler_t fn, void *fn_data);
+void mg_http_serve_dir(struct mg_connection *, struct mg_http_message *hm,
+                       struct mg_http_serve_opts *opts);
+void mg_http_serve_file(struct mg_connection *, struct mg_http_message *hm,
+                        const char *path, struct mg_http_serve_opts *opts);
+void mg_http_reply(struct mg_connection *, int status_code, const char *headers,
+                   const char *body_fmt, ...);
+struct mg_str *mg_http_get_header(struct mg_http_message *, const char *name);
+int mg_http_get_var(const struct mg_str *, const char *name, char *, size_t);
+int mg_url_decode(const char *s, size_t n, char *to, size_t to_len, int form);
+size_t mg_url_encode(const char *s, size_t n, char *buf, size_t len);
+void mg_http_creds(struct mg_http_message *, char *, size_t, char *, size_t);
+bool mg_http_match_uri(const struct mg_http_message *, const char *glob);
+int mg_http_upload(struct mg_connection *, struct mg_http_message *hm,
+                   struct mg_fs *fs, const char *dir);
+void mg_http_bauth(struct mg_connection *, const char *user, const char *pass);
+struct mg_str mg_http_get_header_var(struct mg_str s, struct mg_str v);
+size_t mg_http_next_multipart(struct mg_str, size_t, struct mg_http_part *);
+int mg_http_status(const struct mg_http_message *hm);
+
+
+void mg_http_serve_ssi(struct mg_connection *c, const char *root,
+                       const char *fullpath);
+
+
+
+
+
+
+struct mg_tls_opts {
+  const char *ca;         // CA certificate file. For both listeners and clients
+  const char *crl;        // Certificate Revocation List. For clients
+  const char *cert;       // Certificate
+  const char *certkey;    // Certificate key
+  const char *ciphers;    // Cipher list
+  struct mg_str srvname;  // If not empty, enables server name verification
+  struct mg_fs *fs;       // FS API for reading certificate files
+};
+
+void mg_tls_init(struct mg_connection *, struct mg_tls_opts *);
+void mg_tls_free(struct mg_connection *);
+long mg_tls_send(struct mg_connection *, const void *buf, size_t len);
+long mg_tls_recv(struct mg_connection *, void *buf, size_t len);
+void mg_tls_handshake(struct mg_connection *);
+
+
+
+
+
+
+
+#if MG_ENABLE_MBEDTLS
+#include <mbedtls/debug.h>
+#include <mbedtls/net_sockets.h>
+#include <mbedtls/ssl.h>
+
+struct mg_tls {
+  char *cafile;             // CA certificate path
+  mbedtls_x509_crt ca;      // Parsed CA certificate
+  mbedtls_x509_crl crl;     // Parsed Certificate Revocation List
+  mbedtls_x509_crt cert;    // Parsed certificate
+  mbedtls_ssl_context ssl;  // SSL/TLS context
+  mbedtls_ssl_config conf;  // SSL-TLS config
+  mbedtls_pk_context pk;    // Private key context
+};
+#endif
+
+
+#if MG_ENABLE_OPENSSL
+
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+
+struct mg_tls {
+  SSL_CTX *ctx;
+  SSL *ssl;
+};
+#endif
+
+
+#define WEBSOCKET_OP_CONTINUE 0
+#define WEBSOCKET_OP_TEXT 1
+#define WEBSOCKET_OP_BINARY 2
+#define WEBSOCKET_OP_CLOSE 8
+#define WEBSOCKET_OP_PING 9
+#define WEBSOCKET_OP_PONG 10
+
+
+
+struct mg_ws_message {
+  struct mg_str data;  // Websocket message data
+  uint8_t flags;       // Websocket message flags
+};
+
+struct mg_connection *mg_ws_connect(struct mg_mgr *, const char *url,
+                                    mg_event_handler_t fn, void *fn_data,
+                                    const char *fmt, ...);
+void mg_ws_upgrade(struct mg_connection *, struct mg_http_message *,
+                   const char *fmt, ...);
+size_t mg_ws_send(struct mg_connection *, const char *buf, size_t len, int op);
+size_t mg_ws_wrap(struct mg_connection *, size_t len, int op);
+
+
+
+
+struct mg_connection *mg_sntp_connect(struct mg_mgr *mgr, const char *url,
+                                      mg_event_handler_t fn, void *fn_data);
+void mg_sntp_send(struct mg_connection *c, unsigned long utc);
+int64_t mg_sntp_parse(const unsigned char *buf, size_t len);
+
+
+
+
+
+#define MQTT_CMD_CONNECT 1
+#define MQTT_CMD_CONNACK 2
+#define MQTT_CMD_PUBLISH 3
+#define MQTT_CMD_PUBACK 4
+#define MQTT_CMD_PUBREC 5
+#define MQTT_CMD_PUBREL 6
+#define MQTT_CMD_PUBCOMP 7
+#define MQTT_CMD_SUBSCRIBE 8
+#define MQTT_CMD_SUBACK 9
+#define MQTT_CMD_UNSUBSCRIBE 10
+#define MQTT_CMD_UNSUBACK 11
+#define MQTT_CMD_PINGREQ 12
+#define MQTT_CMD_PINGRESP 13
+#define MQTT_CMD_DISCONNECT 14
+
+struct mg_mqtt_opts {
+  struct mg_str user;          // Username, can be empty
+  struct mg_str pass;          // Password, can be empty
+  struct mg_str client_id;     // Client ID
+  struct mg_str will_topic;    // Will topic
+  struct mg_str will_message;  // Will message
+  uint8_t will_qos;            // Will message quality of service
+  bool will_retain;            // Retain last will
+  bool clean;                  // Use clean session, 0 or 1
+  uint16_t keepalive;          // Keep-alive timer in seconds
+};
+
+struct mg_mqtt_message {
+  struct mg_str topic;  // Parsed topic
+  struct mg_str data;   // Parsed message
+  struct mg_str dgram;  // Whole MQTT datagram, including headers
+  uint16_t id;  // Set for PUBACK, PUBREC, PUBREL, PUBCOMP, SUBACK, PUBLISH
+  uint8_t cmd;  // MQTT command, one of MQTT_CMD_*
+  uint8_t qos;  // Quality of service
+  uint8_t ack;  // Connack return code. 0 - success
+};
+
+struct mg_connection *mg_mqtt_connect(struct mg_mgr *, const char *url,
+                                      struct mg_mqtt_opts *opts,
+                                      mg_event_handler_t fn, void *fn_data);
+struct mg_connection *mg_mqtt_listen(struct mg_mgr *mgr, const char *url,
+                                     mg_event_handler_t fn, void *fn_data);
+void mg_mqtt_login(struct mg_connection *c, struct mg_mqtt_opts *opts);
+void mg_mqtt_pub(struct mg_connection *c, struct mg_str topic,
+                 struct mg_str data, int qos, bool retain);
+void mg_mqtt_sub(struct mg_connection *, struct mg_str topic, int qos);
+int mg_mqtt_parse(const uint8_t *buf, size_t len, struct mg_mqtt_message *m);
+void mg_mqtt_send_header(struct mg_connection *, uint8_t cmd, uint8_t flags,
+                         uint32_t len);
+size_t mg_mqtt_next_sub(struct mg_mqtt_message *msg, struct mg_str *topic,
+                        uint8_t *qos, size_t pos);
+size_t mg_mqtt_next_unsub(struct mg_mqtt_message *msg, struct mg_str *topic,
+                          size_t pos);
+void mg_mqtt_ping(struct mg_connection *);
+void mg_mqtt_pong(struct mg_connection *);
+void mg_mqtt_disconnect(struct mg_connection *);
+
+
+
+
+
+// Mongoose sends DNS queries that contain only one question:
+// either A (IPv4) or AAAA (IPv6) address lookup.
+// Therefore, we expect zero or one answer.
+// If `resolved` is true, then `addr` contains resolved IPv4 or IPV6 address.
+struct mg_dns_message {
+  uint16_t txnid;       // Transaction ID
+  bool resolved;        // Resolve successful, addr is set
+  struct mg_addr addr;  // Resolved address
+  char name[256];       // Host name
+};
+
+struct mg_dns_header {
+  uint16_t txnid;  // Transaction ID
+  uint16_t flags;
+  uint16_t num_questions;
+  uint16_t num_answers;
+  uint16_t num_authority_prs;
+  uint16_t num_other_prs;
+};
+
+// DNS resource record
+struct mg_dns_rr {
+  uint16_t nlen;    // Name or pointer length
+  uint16_t atype;   // Address type
+  uint16_t aclass;  // Address class
+  uint16_t alen;    // Address length
+};
+
+void mg_resolve(struct mg_connection *, const char *url);
+void mg_resolve_cancel(struct mg_connection *);
+bool mg_dns_parse(const uint8_t *buf, size_t len, struct mg_dns_message *);
+size_t mg_dns_parse_rr(const uint8_t *buf, size_t len, size_t ofs,
+                       bool is_question, struct mg_dns_rr *);
+size_t mg_dns_decode_name(const uint8_t *, size_t, size_t, char *, size_t);
+
+#ifdef __cplusplus
+}
+#endif
+#endif  // MONGOOSE_H
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