Update networking layer w/ CURL and emscripten impl

External/curl-8.17.0/docs/cmdline-opts/output.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Long: output
+Arg: <file>
+Short: o
+Help: Write to file instead of stdout
+Category: important output
+Added: 4.0
+Multi: per-URL
+See-also:
+  - out-null
+  - remote-name
+  - remote-name-all
+  - remote-header-name
+Example:
+  - -o file $URL
+  - "http://{one,two}.example.com" -o "file_#1.txt"
+  - "http://{site,host}.host[1-5].example" -o "#1_#2"
+  - -o file $URL -o file2 https://example.net
+---
+
+# `--output`
+
+Write output to the given file instead of stdout. If you are using globbing to
+fetch multiple documents, you should quote the URL and you can use `#`
+followed by a number in the filename. That variable is then replaced with the
+current string for the URL being fetched. Like in:
+
+    curl "http://{one,two}.example.com" -o "file_#1.txt"
+
+or use several variables like:
+
+    curl "http://{site,host}.host[1-5].example" -o "#1_#2"
+
+You may use this option as many times as the number of URLs you have. For
+example, if you specify two URLs on the same command line, you can use it like
+this:
+
+    curl -o aa example.com -o bb example.net
+
+and the order of the -o options and the URLs does not matter, just that the
+first -o is for the first URL and so on, so the above command line can also be
+written as
+
+    curl example.com example.net -o aa -o bb
+
+See also the --create-dirs option to create the local directories
+dynamically. Specifying the output as '-' (a single dash) passes the output to
+stdout.
+
+To suppress response bodies, you can redirect output to /dev/null:
+
+    curl example.com -o /dev/null
+
+Or for Windows:
+
+    curl example.com -o nul
+
+Or, even more efficient and portable, use
+
+    curl example.com --out-null
+
+Specify the filename as single minus to force the output to stdout, to
+override curl's internal binary output in terminal prevention:
+
+    curl https://example.com/jpeg -o -