[quicwg/base-drafts] HTTP/3 priorities interact poorly with application frontend(AFE) priorities (#2740)

ianswett <notifications@github.com> Tue, 21 May 2019 23:19 UTC

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Subject: [quicwg/base-drafts] HTTP/3 priorities interact poorly with application frontend(AFE) priorities (#2740)
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AFEs commonly want to specify priorities, but load balancers connect to multiple AFEs for a given connection, so the AFE is not aware of the existing request priority structure.

An AFE may want to indicate that a request is high or low priority, but in the existing HTTP/3(and HTTP/2) scheme, the load balancer would be responsible for translating that into the priority tree.  The only correct option is to understand how all clients use HTTP/2 priorities and update the priority of the response accordingly.

Ideally a load balancer would not have to convert priorities on a user-agent basis in HTTP/3.

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