Update networking layer w/ CURL and emscripten impl

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

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+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_RESUME_FROM
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_INFILESIZE (3)
+  - CURLOPT_RANGE (3)
+  - CURLOPT_RESUME_FROM_LARGE (3)
+Protocol:
+  - All
+Added-in: 7.1
+---
+
+# NAME
+
+CURLOPT_RESUME_FROM - offset to resume transfer from
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESUME_FROM, long from);
+~~~
+
+# DESCRIPTION
+
+Pass a long as parameter. It contains the offset in number of bytes that you
+want the transfer to start from. Set this option to 0 to make the transfer
+start from the beginning (effectively disabling resume). For FTP, set this
+option to -1 to make the transfer start from the end of the target file
+(useful to continue an interrupted upload).
+
+When doing uploads with FTP, the resume position is where in the local/source
+file libcurl should try to resume the upload from and it then appends the
+source file to the remote target file.
+
+If you need to resume a transfer beyond the 2GB limit, use
+CURLOPT_RESUME_FROM_LARGE(3) instead.
+
+# DEFAULT
+
+0, not used
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    long size_of_file = 6789;
+
+    curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com");
+
+    /* resume upload at byte index 200 */
+    curl_easy_setopt(curl, CURLOPT_RESUME_FROM, 200L);
+
+    /* ask for upload */
+    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+
+    /* set total data amount to expect */
+    curl_easy_setopt(curl, CURLOPT_INFILESIZE, size_of_file);
+
+    /* Perform the request */
+    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).