Re: [quicwg/base-drafts] Why are there two ways of associating push with requests? (#3275)

Kazuho Oku <notifications@github.com> Wed, 27 November 2019 11:55 UTC

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Date: Wed, 27 Nov 2019 03:55:36 -0800
From: Kazuho Oku <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Why are there two ways of associating push with requests? (#3275)
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Note also that the current design has the priority inversion issue.

When the server sends a PUSH_PROMISE frame on request stream A, then sends a DUPLICATE_PUSH frame on stream B referring to the same pushed resource, and if stream B has higher precedence than stream A, then delivery of the request header of the pushed resource might get significantly delayed. Such a behavior would have negative effect on a well-designed client that blocks on the DUPLICATE_PUSH frame until it receives the request header of the pushed resource.

Sending the request headers on the pushed stream resolves the issue. The server can more easily control the priority of a pushed stream, it becomes much easier to send the request headers of a pushed response before anything else.

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