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alt-svc: more flexibility on same destination

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When the Alt-Svc points to the same host and port, add the destination
ALPN to the `wanted` versions and set it also as the `preferred` version
in negotiations.

This allows Alt-Svc for h3 to point to h2 and have it tried first. Also,
this allows Alt-Svc to say http/1.1 is preferred and changes the ALPN
protocol ordering for the TLS handshake.

Add tests in various combination to verify this works.

Reported-by: yushicheng7788 on github
Fixes #19740
Closes #19874
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Stefan Eissing 2025-12-08 13:36:19 +01:00 • committed by Daniel Stenberg
parent f450f3801b
commit 5ed7b5b01b
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lib/http.h
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@ -72,6 +72,7 @@ struct http_negotiation {
unsigned char rcvd_min; /* minimum version seen in responses, 09, 10, 11 */
http_majors wanted; /* wanted major versions when talking to server */
http_majors allowed; /* allowed major versions when talking to server */
http_majors preferred; /* preferred major version when talking to server */
BIT(h2_upgrade); /* Do HTTP Upgrade from 1.1 to 2 */
BIT(h2_prior_knowledge); /* Directly do HTTP/2 without ALPN/SSL */
BIT(accept_09); /* Accept an HTTP/0.9 response */