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FetchEvent.handled

Category

Service Worker

Type

New or changed feature

Status

Enabled by default (Chrome 86)

Intent stage

Shipped

Summary

A FetchEvent dispatched to a service worker is in a loading pipeline, which is performance sensitive. The new FetchEvent.handled property returns a promise that resolves when a response is returned from a service worker to its client. This enables a service worker to delay tasks that can only run after responses are complete.

Standards & signals

• Specification: https://w3c.github.io/ServiceWorker/#fetch-event-handled
• Firefox: Positive
• Safari: Positive
• Web developers: Positive
• Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1039558

Docs: https://github.com/w3c/ServiceWorker/issues/1397

Samples: https://github.com/w3c/ServiceWorker/issues/1397#issuecomment-479036562

Explainers: https://github.com/tingshao/FetchEvent.handled

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