Update networking layer w/ CURL and emscripten impl

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

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+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_NOSIGNAL
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_TIMEOUT (3)
+Protocol:
+  - All
+Added-in: 7.10
+---
+
+# NAME
+
+CURLOPT_NOSIGNAL - skip all signal handling
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_NOSIGNAL, long onoff);
+~~~
+
+# DESCRIPTION
+
+If *onoff* is 1, libcurl uses no functions that install signal handlers or
+any functions that cause signals to be sent to the process. This option is
+here to allow multi-threaded Unix applications to still set/use all timeout
+options etc, without risking getting signals.
+
+If this option is set and libcurl has been built with the standard name
+resolver, timeouts cannot occur while the name resolve takes place. Consider
+building libcurl with the c-ares or threaded resolver backends to enable
+asynchronous DNS lookups, to enable timeouts for name resolves without the use
+of signals.
+
+Setting CURLOPT_NOSIGNAL(3) to 1 makes libcurl NOT ask the system to
+ignore SIGPIPE signals, which otherwise are sent by the system when trying to
+send data to a socket which is closed in the other end. libcurl makes an
+effort to never cause such SIGPIPE signals to trigger, but some operating
+systems have no way to avoid them and even on those that have there are some
+corner cases when they may still happen, contrary to our desire.
+
+# DEFAULT
+
+0
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
+
+    curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1L);
+
+    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).