curl/docs/cmdline-opts/proxy-negotiate.md

c	SPDX-License-Identifier	Long	Help	Added	Category	Multi	See-also	Example
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.	curl	proxy-negotiate	Use HTTP Negotiate (SPNEGO) authentication on the proxy	7.17.1	proxy auth	mutex	proxy-anyauth proxy-basic	--proxy-negotiate --proxy-user user:passwd -x proxy $URL

--proxy-negotiate

Tells curl to use HTTP Negotiate (SPNEGO) authentication when communicating with the given proxy. Use --negotiate for enabling HTTP Negotiate (SPNEGO) with a remote host.