Update networking layer w/ CURL and emscripten impl

External/curl-8.17.0/docs/libcurl/curl_url_cleanup.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: curl_url_cleanup
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_CURLU (3)
+  - curl_url (3)
+  - curl_url_dup (3)
+  - curl_url_get (3)
+  - curl_url_set (3)
+Protocol:
+  - All
+Added-in: 7.62.0
+---
+
+# NAME
+
+curl_url_cleanup - free the URL handle
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+void curl_url_cleanup(CURLU *handle);
+~~~
+
+# DESCRIPTION
+
+Frees all the resources associated with the given *CURLU* handle.
+
+Passing in a NULL pointer in *handle* makes this function return
+immediately with no action.
+
+Any use of the **handle** after this function has been called and have
+returned, is illegal.
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURLU *url = curl_url();
+  curl_url_set(url, CURLUPART_URL, "https://example.com", 0);
+  curl_url_cleanup(url);
+}
+~~~
+
+# %AVAILABILITY%
+
+# RETURN VALUE
+
+none