Contact emails sisidov...@chromium.org
Explainer https://github.com/explainers-by-googlers/service-worker-auto-preload Specification None yet, we’ll write one after the experiment. Summary ServiceWorkerAutoPreload is the mode where the browser issues the network request in parallel with the ServiceWorker bootstrap, and consumes the network request result inside the fetch handler if the fetch handler returns the response with respondwith. If the fetch handler result is fallback, pass the response directly to the browser. Blink component Blink>ServiceWorker <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EServiceWorker> TAG review https://github.com/w3ctag/design-reviews/issues/963 TAG review status Pending Risks Interoperability and Compatibility For compatibility risks, the main concern is about how this feature works with the navigation preload API. But we don't think this feature introduces major compatibility issues because this feature respects the navigation preload API, and is not exposed when the navigation preload API is already enabled. The only cost is the server side cost to respond to the network requests, which may not be used if the fetch handler returns a result from the disk cache. This cost can be mitigated by applying the feature only for websites that meet some criteria e.g. fetch handler always fallback to the network Gecko: No signal (https://github.com/mozilla/standards-positions/issues/1036 ) WebKit: No signal (https://github.com/WebKit/standards-positions/issues/359) 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 Goals for experimentation Our intent is to run a Finch experiment on 1% Stable instead of Origin Trials, because this feature is only exposed with heuristics and it doesn't have an API surface. We run the experiment to evaluate the potential impact of ServiceWorkerAutoPreload on the loading metrics. And also we’d like to gather inputs and feedback to decide a reasonable criteria, or conditions to enable ServiceWorkerAutoPreload when it’s fully launched. Conversely, currently we don’t have a plan to ship this feature as it is without any criteria or conditions. Experiment Risks The cost of this feature is to increase the server side cost to respond to the network requests. For the experiment, we are going to enable the feature on 1% traffic. Ongoing technical constraints None Debuggability We have a plan to show some info when the preload requests by this feature are triggered on DevTools. It's tracked in crbug.com/344912796 Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, ChromeOS, Android, and Android WebView)? No Is this feature fully tested by web-platform-tests <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md> ? No Currently we don't have WPT tests. As this feature is only exposed with heuristics and it doesn't have an API surface, it's not testable on the WPT infrastructure. Flag name on about://flags #service-worker-auto-preload Finch feature name ServiceWorkerAutoPreload Requires code in //chrome? False Estimated milestones Estimated milestones are for Finch, not for the Origin Trials. desktop first 131 desktop last 136 Android first 131 Android last 136 Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5194817700364288?gate=5100561098866688 Links to previous Intent discussions Intent to Prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAGMyg-btkw3n_k0Vr9GgW%2B_c%2BT5K%3D_1_BPFstqAVi0y%3DxxT-pg%40mail.gmail.com 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 visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAGMyg-YF1qRNkBUPGxN-GgDGG3yvqCijZ56QEQYgNA4a9YrfMg%40mail.gmail.com.
