Secure context
This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The Accept-CH-Lifetime header is set by the server to specify the persistence of Accept-CH header value that specifies for which Client Hints headers client should include in subsequent requests.

Note: Client Hints are accessible only on secure origins (via TLS). Accept-CH and Accept-CH-Lifetime headers should be persisted for all secure requests to ensure Client Hints are sent reliably.


Accept-CH-Lifetime: <age>


Accept-CH: Viewport-Width, DPR
Accept-CH-Lifetime: 86400

Browser compatibilityUpdate compatibility data on GitHub

Chrome Edge Firefox Internet Explorer Opera Safari
Accept-CH-Lifetime 67 ≤79 ? ? 54 ?
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
Accept-CH-Lifetime 67 67 ? ? ? 9.0

See also

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