net/http: apply header timeout to server's unencrypted HTTP/2 check When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. This read was being done with no timeout applied. Apply the header timeout (since this is essentially reading the first headers from the connection). Hoist the header timeout into the server serve loop so we can use a single timeout to cover both the HTTP/2 preface and the first HTTP/1 headers. Thanks to Vsevolod Naumov and Ainar Garipov from AdGuard for reporting this issue. Fixes #80205 Fixes CVE-2026-56853 Change-Id: I69943a79453967bc2f70da5b5ceeac936a6a6964 Reviewed-on: https://go-review.googlesource.com/c/go/+/795540 Reviewed-by: Nicholas Husin <nsh@golang.org> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Nicholas Husin <husin@google.com> Auto-Submit: Damien Neil <dneil@google.com>
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