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