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.
Warning: The header was removed from the specification in draft 8.
Accept-CH-Lifetime header is set by the server to
specify the persistence of the client hint headers it specified using
Accept-CH, that the client should
include in subsequent requests.
|Header type||Response header|
|Forbidden header name||no|
|CORS-safelisted response header||no|
Note: Client Hints are accessible only on secure origins (via TLS).
Accept-CH-Lifetime headers should be persisted for all secure requests
to ensure Client Hints are sent reliably.
Accept-CH: Viewport-Width Accept-CH-Lifetime: 86400
BCD tables only load in the browser