[webkit-dev] Request for position: ALPS and ACCEPT_CH HTTP/2 and HTTP/3 frames

[Mike Taylor]

Hi there,

Complimentary to 
https://lists.webkit.org/pipermail/webkit-dev/2021-January/031673.html, 
Chromium intends to ship the ALPS + ACCEPT_CH HTTP/2 and HTTP/3 frames 
portions of the Client Hints reliability proposal, and we would like to 
solicit WebKit's position.

As mentioned in the linked thread, the Client Hint Reliability proposal 
is a set of features aimed at making Client Hints more reliably 
available and mitigating mis-matches between a site's preferences and 
the preferences stored in the browser.

In particular, The ACCEPT_CH HTTP/2 and HTTP/3 frames, combined with the 
TLS ALPS extension, are a connection-level optimization to deliver the 
server’s Client Hint preferences in time for the first HTTP request.

Specifications:

https://tools.ietf.org/html/draft-davidben-http-client-hint-reliability 
(section 4)
https://tools.ietf.org/html/draft-vvv-httpbis-alps
https://tools.ietf.org/html/draft-vvv-tls-alps
https://github.com/WICG/client-hints-infrastructure/blob/main/reliability.md#connection-level-settings

thanks,
Mike