Fix #2871 - accept * in mg_http_serve_opts::mime_types

mongoose.c

@@ -2737,7 +2737,7 @@ static struct mg_str s_known_types[] = {
 // clang-format on
 
 static struct mg_str guess_content_type(struct mg_str path, const char *extra) {
-  struct mg_str entry, k, v, s = mg_str(extra);
+  struct mg_str entry, k, v, s = mg_str(extra), asterisk = mg_str_n("*", 1);
   size_t i = 0;
 
   // Shrink path to its extension only
@@ -2747,7 +2747,9 @@ static struct mg_str guess_content_type(struct mg_str path, const char *extra) {
 
   // Process user-provided mime type overrides, if any
   while (mg_span(s, &entry, &s, ',')) {
-    if (mg_span(entry, &k, &v, '=') && mg_strcmp(path, k) == 0) return v;
+    if (mg_span(entry, &k, &v, '=') &&
+        (mg_strcmp(asterisk, k) == 0 || mg_strcmp(path, k) == 0))
+      return v;
   }
 
   // Process built-in mime types