curl-w32/docs/cmdline-opts/proxy-anyauth.md

c	SPDX-License-Identifier	Long	Help	Added	Category	Multi	See-also	Example
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.	curl	proxy-anyauth	Pick any proxy authentication method	7.13.2	proxy auth	mutex	proxy proxy-basic proxy-digest	--proxy-anyauth --proxy-user user:passwd -x proxy $URL

--proxy-anyauth

Tells curl to pick a suitable authentication method when communicating with the given HTTP proxy. This might cause an extra request/response round-trip.