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Explainer None. This is a minor change and we are sharing it to provide transparency into changes that we are implementing. Specification https://www.rfc-editor.org/rfc/rfc9110#field.user-agent Summary User Agent (UA) strings in Chromium have been moving towards reducing or freezing information - but until WebKit allows us to implement UA client hints, we propose adding the bugfix number to the UA, for compatibility purposes. Blink component Chromium>Mobile>iOSWeb <https://bugs.chromium.org/p/chromium/issues/list?q=component:Chromium%3EMobile%3EiOSWeb> Motivation The Chrome for iOS User-Agent header only includes the major and minor version numbers, while Safari and Firefox for iOS include the major, minor, and bugfix numbers. We have received a request from external partners to match this pattern, and are aware of at least one platform that relies on having an accurate bugfix version number to ensure the latest security updates are installed. UA strings in Chromium have been moving towards reducing or freezing information - but until WebKit allows us to implement UA client hints, we propose adding the bugfix number to the UA, for compatibility purposes. In practice: Before this change: Mozilla/5.0 (iPhone; CPU iPhone OS 17_5 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) CriOS/123.0.2924.75 Mobile/14E5239e Safari/602.1 After this change (note the additional “_1” in the OS version token): Mozilla/5.0 (iPhone; CPU iPhone OS 17_5_1 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) CriOS/123.0.2924.75 Mobile/14E5239e Safari/602.1 Initial public proposal None TAG review None TAG review status Not applicable Risks Interoperability and Compatibility None Gecko: No signal (Firefox on iOS already follows this pattern) WebKit: No signal (mobile Safari already follows this pattern) Web developers: We have received at least one external partner request for this change. WebView application risks Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications? N/A (this is for iOS) Debuggability None Is this feature fully tested by web-platform-tests <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md> ? No Flag name on chrome://flags None Finch feature name kAddBugFixNumber Non-finch justification None Requires code in //chrome? False Tracking bug https://issues.chromium.org/u/1/issues/350426233 Estimated milestones No milestones specified Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5084885065400320?gate=5184007944536064 -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAGspLPgHj4gecRn2A1Y8EDMxiJ8CQ4gwrTcH%3DgW-nTzoR3Mh3w%40mail.gmail.com.
