Update networking layer w/ CURL and emscripten impl

External/curl-8.17.0/docs/libcurl/opts/CURLOPT_MAXCONNECTS.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_MAXCONNECTS
+Section: 3
+Source: libcurl
+See-also:
+  - CURLMOPT_MAXCONNECTS (3)
+  - CURLMOPT_MAX_HOST_CONNECTIONS (3)
+  - CURLMOPT_MAX_TOTAL_CONNECTIONS (3)
+  - CURLOPT_MAXREDIRS (3)
+Protocol:
+  - All
+Added-in: 7.7
+---
+
+# NAME
+
+CURLOPT_MAXCONNECTS - maximum connection cache size
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAXCONNECTS, long amount);
+~~~
+
+# DESCRIPTION
+
+Pass a long. The set *amount* is the maximum number of connections that
+libcurl may keep alive in its connection cache after use. The default is 5,
+and there is not much point in changing this value unless you are perfectly
+aware of how this works. This concerns connections using any of the protocols
+that support persistent connections.
+
+When reaching the maximum limit, curl closes the oldest connection present in
+the cache to prevent the number of connections from increasing.
+
+If you already have performed transfers with this curl handle, setting a
+smaller CURLOPT_MAXCONNECTS(3) than before may cause open connections to get
+closed unnecessarily.
+
+If you add this easy handle to a multi handle, this setting is not
+acknowledged, and you must instead use curl_multi_setopt(3) and the
+CURLMOPT_MAXCONNECTS(3) option.
+
+# DEFAULT
+
+5
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode ret;
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
+    /* limit the connection cache for this handle to no more than 3 */
+    curl_easy_setopt(curl, CURLOPT_MAXCONNECTS, 3L);
+    ret = curl_easy_perform(curl);
+  }
+}
+~~~
+
+# %AVAILABILITY%
+
+# RETURN VALUE
+
+curl_easy_setopt(3) returns a CURLcode indicating success or error.
+
+CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
+libcurl-errors(3).