commit 5df53e057eec8f9dd6ae8e9feb05d7c9b259b527
author kenoss <kenoss@chromium.org> Mon Jun 17 06:59:52 2024
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Mon Jun 17 06:59:52 2024
tree a2d5cd8466b8d05490053556f1ca12e9d7f3ba7e
parent 865aca6c93b13c4387841eddb9af834afa7b6b95

PrerenderFallback: Use Sec-Purpose header value "prefetch;prerender"

This CL makes that prefetch uses a HTTP request header
"Sec-Purpose: prefetch;prerender" for prefetch ahead of prerender.

Note that "Purpose" header is unchanged. For more details, see
https://github.com/WICG/nav-speculation/issues/133#issuecomment-1035315997

In addition, this CL makes prefetch not eligible if it's ahead of
prerender and cross-origin, so that we ensure that Chrome doesn't send
a request with "Sec-Purpose: prefetch;anonymous-client-ip;prerender"
as it is not in the spec yet.

No behavioral change if kPrerender2Fallback is disabled.

NO_IFTTT=Wrote //tools/metrics/histograms/enums.xml entry and I will do https://docs.google.com/document/d/1PnrfowsZMt62PX1EvvTp2Nqs3ji1zrklrAEe1JYbkTk

Fexed: 342539088
Change-Id: I6ea9461a0a6fc20d990e65e746431dc5287fdfb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5580112
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Lingqi Chi <lingqi@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Ken Okada <kenoss@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1315672}