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Explainer https://github.com/w3c/resource-hints/issues/74 Specification https://chromium-review.googlesource.com/c/chromium/src/+/6334746 Summary Chrome currently passes both 'Purpose: prefetch' and 'Sec-Purpose: prefetch' headers as part of prefetch through speculation rules. However, only 'Purpose: prefetch' is passed with <link rel=prefetch>. We plan to standardize this header for both speculation rules and <link rel=prefetch> by adding 'Sec-Purpose: prefetch' header to the latter. Future work will involve stop sending 'Purpose: prefetch' for prefetches, prerenders, etc. Blink component Blink>Loader Motivation SpeculationRules prefetch does send Sec-Purpose: "prefetch" header, but rel="prefetch" does not. The purpose headers allows servers to discern between regular requests and "resource hints" (requests that are only meant to populate caches). Initial public proposal None TAG review Not filed as this is a minor change of unspec'ed UA behavior for an existing feature. (Can start a review if recommended) TAG review status Pending Risks Interoperability and Compatibility As commented at notes on Firefox and Safari, each browser uses non-standardized header name that is not aligned with CORS spec. This change will introduce better interoperability and compatibility for a long term. Gecko: No signal Firefox has sent 'X-moz: prefetch'. WebKit: No signal Safari has sent 'Purpose: prefetch' but changed to use 'X-Purpose: preview'. Web developers: No signals 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? None Debuggability Is this feature fully tested by web-platform-tests? No Plan to add a new test. Flag name on about://flags None Finch feature name None Non-finch justification None Requires code in //chrome? False Tracking bug https://issues.chromium.org/issues/40236973 Estimated milestones No milestones specified Link to entry on the Chrome Platform Status https://chromestatus.com/feature/6247959677108224?gate=5461946554384384 This intent message was generated by Chrome Platform Status. -- 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 visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/680fb6c9.050a0220.1699c.03f6.GAE%40google.com.
