HTTP Client Hints

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HTTP Client Hints (or simply Client Hints) are a set of

Hypertext Transfer Protocol (HTTP).[1] The client can advertise information about itself through these fields so the server
can determine which resources should be included in its response.

As an abstract example, the server might indicate in an Accept-CH response header of an initial request that it can accept device pixel ratio information from the client. The client will then make future requests using a header field containing these details, and the server will respond with images appropriate for that device pixel ratio.

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