curl/docs/cmdline-opts/proxy1.0.md

c	SPDX-License-Identifier	Long	Arg	Help	Category	Added	Multi	See-also	Example
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.	curl	proxy1.0	<host[:port]>	Use HTTP/1.0 proxy on given port	proxy	7.19.4	mutex	proxy socks5 preproxy	--proxy1.0 http://proxy $URL

--proxy1.0

Use the specified HTTP 1.0 proxy. If the port number is not specified, it is assumed at port 1080.

The only difference between this and the HTTP proxy option --proxy, is that attempts to use CONNECT through the proxy specifies an HTTP 1.0 protocol instead of the default HTTP 1.1.