Accept-CH-Lifetime

Secure context

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

Deprecated

This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

Non-standard

This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

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.

Header type Response header
Forbidden header name ?

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.

Syntax

Accept-CH-Lifetime: <age>

Examples

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

Browser compatibility

BCD tables only load in the browser

See also