Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Accept-CH header may be set by a server to specify
which client hints headers a 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: <comma separated list of client hint headers>
Accept-CH: Viewport-Width, Width Vary: Viewport-Width, Width
Note: Remember to vary the response based on the accepted client hints.
|HTTP Client Hints |
BCD tables only load in the browser