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

Kazuho Oku <notifications@github.com> Tue, 17 December 2019 04:53 UTC

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Subject: Re: [quicwg/base-drafts] Why are there two ways of associating push with requests? (#3275)
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@MikeBishop Thank you for laying down the options.

My preference goes to:

> * **Multiple PUSH_PROMISE frames on different streams.** Old H3-style; wastes some bytes repeating yourself, and now we have to talk about consistency between them:
>   * **Not allowed to differ**; client has to check that the headers are the same. What if they're not? How long does the client have to keep the headers? Need it be the same bytes, or simply the same resulting header set?

Regarding the points listed as questions, I think we should state that the header set that the server sends MUST contain the exact same bytes (after decompression), and that a client MUST either validate that they are the same, or ignore the PUSH_PROMISE.

By using MAX_PUSH_ID frame, the client controls the number of pushes that the server can initiate. It can track the unused push IDs much like the QUIC transport tracks unused stream IDs. By tracking that, the client can tell if a PUSH_PROMISE frame contains a new push or if is a duplicate. If it is a duplicate that it has already forgotten, then it can simply ignore it.

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