User-Agent 👀 Client Hints

[Response] Server asked for:

Seeing double values?The spec is changing to make the hint tokens match the header name, i.e. always including the Sec-CH- prefix. In the transition period, this demo sends both formats. 
Accept-CH:

[Subsequent Request] Client sent:

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[For comparison] User-Agent:

[…]

Server should ask for:

Available hints