Update networking layer w/ CURL and emscripten impl

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

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+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Long: negotiate
+Help: Use HTTP Negotiate (SPNEGO) authentication
+Protocols: HTTP
+Category: auth http
+Added: 7.10.6
+Multi: boolean
+See-also:
+  - basic
+  - ntlm
+  - anyauth
+  - proxy-negotiate
+Example:
+  - --negotiate -u : $URL
+---
+
+# `--negotiate`
+
+Enable Negotiate (SPNEGO) authentication.
+
+This option requires a library built with GSS-API or SSPI support. Use
+--version to see if your curl supports GSS-API/SSPI or SPNEGO.
+
+When using this option, you must also provide a fake --user option to activate
+the authentication code properly. Sending a '-u :' is enough as the username
+and password from the --user option are not actually used.