A server requests the Sec-CH-UA-Model header by including Accept-CH in a response to any request from the client, using the name of the desired header as a token:
HTTP/1.1 200 OK
Accept-CH: Sec-CH-UA-Model
The client may choose to provide the hint, and add the Sec-CH-UA-Model header to subsequent requests. For example, on mobile phone the client might add the header as shown:
GET /my/page HTTP/1.1
Host: example.site
Sec-CH-UA: " Not A;Brand";v="99", "Chromium";v="96", "Google Chrome";v="96"
Sec-CH-UA-Mobile: ?1
Sec-CH-UA-Platform: "Android"
Sec-CH-UA-Bitness: "64"
Sec-CH-UA-Model: "Pixel 3 XL"
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