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Explainer None Specification None Summary Now that prefetches and prerenders are utilizing the Sec-Purpose header for prefetches and prerenders, we will move to remove the legacy Purpose: "prefetch" header that is still currently passed. This will be behind a feature flag/ kill switch to prevent compat issues. Blink component Blink>Loader>Preload Motivation Each browser uses non-standardized header name that is not aligned with CORS spec (Mozilla's x-moz, chrome's purpose, and Safari doesn't support prefetch yet). As part of standardizing the header names, Sec-Purpose: "prefetch" and Sec-Purpose: "prefetch;prerender" is used. This is to remove current legacy code that still adds the Purpose: "prefetch" header to maintain the standardized name going into the future. Initial public proposal https://fetch.spec.whatwg.org/#sec-purpose-header TAG review None 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 WebKit: No signal 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 None Is this feature fully tested by web-platform-tests? Yes https://wpt.fyi/results/preload/prefetch-headers.https.html?label=experimental&label=master&aligned Flag name on about://flags None Finch feature name RemovePurposeHeaderForPrefetch Requires code in //chrome? False Estimated milestones No milestones specified Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5088012836536320?gate=5078009555714048 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/6836470b.2b0a0220.33c819.0963.GAE%40google.com.
