Update networking layer w/ CURL and emscripten impl

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

@@ -0,0 +1,74 @@
+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_PORT
+Section: 3
+Source: libcurl
+See-also:
+  - CURLINFO_PRIMARY_PORT (3)
+  - CURLOPT_STDERR (3)
+  - CURLOPT_URL (3)
+Protocol:
+  - All
+Added-in: 7.1
+---
+
+# NAME
+
+CURLOPT_PORT - remote port number to connect to
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PORT, long number);
+~~~
+
+# DESCRIPTION
+
+We discourage using this option since its scope is not obvious and hard to
+predict. Set the preferred port number in the URL instead.
+
+This option sets *number* to be the remote port number to connect to,
+instead of the one specified in the URL or the default port for the used
+protocol.
+
+Usually, you just let the URL decide which port to use but this allows the
+application to override that.
+
+While this option accepts a 'long', a port number is an unsigned 16 bit number
+and therefore using a port number lower than zero or over 65535 causes a
+**CURLE_BAD_FUNCTION_ARGUMENT** error.
+
+# DEFAULT
+
+0 which makes it not used. This also makes port number zero impossible to set
+with this API.
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
+    curl_easy_setopt(curl, CURLOPT_PORT, 8080L);
+    res = curl_easy_perform(curl);
+    curl_easy_cleanup(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).