Update networking layer w/ CURL and emscripten impl

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

@@ -0,0 +1,83 @@
+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_FTPSSLAUTH
+Section: 3
+Source: libcurl
+Protocol:
+  - FTP
+See-also:
+  - CURLOPT_FTP_SSL_CCC (3)
+  - CURLOPT_USE_SSL (3)
+Added-in: 7.12.2
+---
+
+# NAME
+
+CURLOPT_FTPSSLAUTH - order in which to attempt TLS vs SSL
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPSSLAUTH, long order);
+~~~
+
+# DESCRIPTION
+
+Pass a long using one of the values from below, to alter how libcurl issues
+"AUTH TLS" or "AUTH SSL" when FTP over SSL is activated. This is only
+interesting if CURLOPT_USE_SSL(3) is also set.
+
+Possible *order* values:
+
+## CURLFTPAUTH_DEFAULT
+
+Allow libcurl to decide.
+
+## CURLFTPAUTH_SSL
+
+Try "AUTH SSL" first, and only if that fails try "AUTH TLS".
+
+## CURLFTPAUTH_TLS
+
+Try "AUTH TLS" first, and only if that fails try "AUTH SSL".
+
+# DEFAULT
+
+CURLFTPAUTH_DEFAULT
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");
+    curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_TRY);
+    /* funny server, ask for SSL before TLS */
+    curl_easy_setopt(curl, CURLOPT_FTPSSLAUTH, CURLFTPAUTH_SSL);
+    res = curl_easy_perform(curl);
+    curl_easy_cleanup(curl);
+  }
+}
+~~~
+
+# HISTORY
+
+**CURLFTPAUTH_*** enums became `long` types in 8.16.0, prior to this version
+a `long` cast was necessary when passed to curl_easy_setopt(3).
+
+# %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).