Contact emails victor...@chromium.org, miketa...@chromium.org
Explainer https://github.com/WICG/client-hints-infrastructure#readme https://github.com/WICG/ua-client-hints#explainer-reducing-user-agent-granularity Specification https://wicg.github.io/ua-client-hints/ Summary User-agent client hints (a set of `Sec-CH-UA-*`) aim to deprecate and replace the User-Agent header to reduce the passive fingerprinting surface we expose via HTTP requests. As we previously rolled-out user-agent client hints on Windows, Mac, Linux, Chrome OS and Android, we intend to proceed with shipping user-agent client hints on Android WebView. For overridden user-agent strings, we only populate user-agent client hints if the overridden user-agent contains the default user-agent. In this case, we will only generate low-entropy user-agent client hints If users also override the user-agent string through command-line. Blink component Blink>Network>ClientHints TAG review https://github.com/w3ctag/design-reviews/issues/320 TAG review status Closed. Risks Interoperability and Compatibility Introducing User-Agent client hints in itself won't affect any page since it's purely opt-in features. It helps us to improve the interoperability between Chrome and WebView. Here is our proposed rollout plan in Chrome Stable channel (Canary/Dev/Beta has been enabled 50%), with the understanding that if we discover concerning breakage or regressions via health metrics or bug reports we will pause the rollout: Stage Duration Date Stable 1% (M116+) M116 stable release is shipping to 100% (a best guess) Aug 22, 2023 Stable 10% (M116+) ~2 weeks after previous stage Sep 5, 2023 TOT Default (M117) ~2 weeks after previous stage Sep 19, 2023 Stable 100% (M116=>M117) ~ Same business day as previous stage Sep 19, 2023 Gecko: Non-harmful on User-Agent client hints ( https://github.com/mozilla/standards-positions/issues/202). WebKit: No signals (https://github.com/WebKit/standards-positions/issues/70 ). Web developers: Mixed signals (https://crbug.com/1430051 <https://bugs.chromium.org/p/chromium/issues/detail?id=1430051>). We know at least one site that uses user-agent client hints on Android WebView.. Debuggability No special DevTools support needed. The UA Client Hints headers will be as debuggable as other request headers, through DevTools’ network tab. Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)? Yes Notes: The existing flag UserAgentClientHint was already enabled for other five platforms (Windows, Mac, Linux, Chrome OS and Android). Is this feature fully tested by web-platform-tests <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md> ? https://wpt.fyi/results/client-hints Flag name UserAgentClientHint Tracking bug https://crbug.com/1430051 <https://bugs.chromium.org/p/chromium/issues/detail?id=1430051> Launch bug https://launch.corp.google.com/launch/4261345 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5127746375647232 -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAJh4P7HgdbnjwsYqgMiS%3D0Anp8y77ipvaQ1j8MWAL7YApoVnXA%40mail.gmail.com.
