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.
The Accept-CH header is set by the server to specify
which Client Hints headers a 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: <list of client hints>
Examples
Accept-CH: Viewport-Width Accept-CH: Width Accept-CH-Lifetime: 86400 Vary: Viewport-Width, Width
Note: Remember to vary the response based on the accepted client hints.
Browser compatibility
BCD tables only load in the browser
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.