draconisplusplus/subprojects/curl-8.10.1/docs/cmdline-opts/proxy-ciphers.md

c	SPDX-License-Identifier	Long	Arg	Help	Protocols	Added	Category	Multi	See-also	Example
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.	curl	proxy-ciphers	<list>	TLS 1.2 (1.1, 1.0) ciphers to use for proxy	TLS	7.52.0	proxy tls	single	proxy-tls13-ciphers ciphers proxy	--proxy-ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256 -x https://proxy $URL

--proxy-ciphers

Same as --ciphers but used in HTTPS proxy context.

Specify which cipher suites to use in the connection to your HTTPS proxy when it negotiates TLS 1.2 (1.1, 1.0). The list of ciphers suites must specify valid ciphers. Read up on cipher suite details on this URL:

https://curl.se/docs/ssl-ciphers.html