Accept-CH
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The HTTP Accept-CH
response header may be set by a server to specify which client hint headers should be included by the client in subsequent requests.
To ensure client hints are sent reliably, the Accept-CH
header should be persisted for all secure requests.
Header type | Response header |
---|---|
Forbidden header name | No |
CORS-safelisted response header | No |
Syntax
http
Accept-CH: <client-hints-headers>
// Client hint headers in a comma-separated list
Accept-CH: <ch-header-one>, <ch-header-two>
Examples
Client hint response headers
The following response headers indicate that the server accepts Viewport-Width
and Width
device client hints in subsequent requests.
The Vary
header indicates which values were used to vary the response based on the accepted client hints.
http
Accept-CH: Viewport-Width, Width
Vary: Viewport-Width, Width
Specifications
Specification |
---|
HTTP Client Hints # section-3.1 |
Browser compatibility
BCD tables only load in the browser