Contact emailsnrosent...@chromium.org ExplainerNone
Specificationhttps://github.com/whatwg/html/pull/8111 Summary Currently when a resource is prefetched using <link rel=prefetch>, we ignore its cache semantics (namely max-age & no-cache) for the first use within 5 minutes, to avoid refetching. Proposing to remove this behavior and use standard HTTP cache semantics. Blink componentBlink>Loader <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ELoader> Motivation The 5-minute rule was never standardized, not implemented by other browsers, and now as part of an effort to make prefetch interoperable across browsers I would like to align on a behavior that doesn't include this. Data to support this: 1. A UMA histogram <https://uma.googleplex.com/p/chrome/timeline_v2?sid=5f237b8589cdf9f292c40b976fbfe69c> shows that 0.05% of prefetch reuses actually benefit from this. About 85% of prefetches are reused regardless (e.g. inside the max-age anyway), and about 15% are not reused (e.g. 5 minutes have passed, not the first reuse). 2. Developers who rely on this can opt-in to this behavior, by setting a 5-minute max-age on prefetch requests (requests with a [Sec-]Purpose: prefetch header). Spec PR to align on prefetch processing: https://github.com/whatwg/html/pull/8111 Chromium Bug for the removal: https://bugs.chromium.org/p/chromium/issues/detail?id=1345207 Initial public proposal TAG review TAG review statusNot applicable Risks Interoperability and Compatibility *Gecko*: Already not implementing this *WebKit*: Positive on aligning on prefetch *Web developers*: very low usage of this feature, as shown by UMA *Other signals*: 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? Debuggability 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 Requires code in //chrome?False Estimated milestones No milestones specified Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5087526916718592 This intent message was generated by Chrome Platform Status <https://chromestatus.com/>. -- 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/CAJn%3DMYbofUd72PVePP47%2BvZF-rLyLn1jdFrTwp%3D0Cv%3D09GvfPw%40mail.gmail.com.
