Update networking layer w/ CURL and emscripten impl

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

@@ -0,0 +1,92 @@
+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_FTP_FILEMETHOD
+Section: 3
+Source: libcurl
+Protocol:
+  - FTP
+See-also:
+  - CURLOPT_DIRLISTONLY (3)
+  - CURLOPT_FTP_SKIP_PASV_IP (3)
+Added-in: 7.15.1
+---
+
+# NAME
+
+CURLOPT_FTP_FILEMETHOD - select directory traversing method for FTP
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_FILEMETHOD,
+                          long method);
+~~~
+
+# DESCRIPTION
+
+Pass a long telling libcurl which *method* to use to reach a file on a
+FTP(S) server.
+
+This option exists because some server implementations are not compliant to
+what the standards say should work.
+
+The argument should be one of the following alternatives:
+
+## CURLFTPMETHOD_MULTICWD
+
+libcurl does a single CWD operation for each path part in the given URL. For
+deep hierarchies this means many commands. This is how RFC 1738 says it should
+be done. This is the default but the slowest behavior.
+
+## CURLFTPMETHOD_NOCWD
+
+libcurl makes no CWD at all. libcurl does SIZE, RETR, STOR etc and gives a
+full path to the server for all these commands. This is the fastest behavior
+since it skips having to change directories.
+
+## CURLFTPMETHOD_SINGLECWD
+
+libcurl does one CWD with the full target directory and then operates on the
+file &"normally" (like in the multicwd case). This is somewhat more standards
+compliant than 'nocwd' but without the full penalty of 'multicwd'.
+
+# DEFAULT
+
+CURLFTPMETHOD_MULTICWD
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/1/2/3/4/new.txt");
+    curl_easy_setopt(curl, CURLOPT_FTP_FILEMETHOD, CURLFTPMETHOD_SINGLECWD);
+
+    res = curl_easy_perform(curl);
+
+    curl_easy_cleanup(curl);
+  }
+}
+~~~
+
+# HISTORY
+
+**CURLFTPMETHOD_*** 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).