[quicwg/base-drafts] HTTP: Limit priority state before stream is opened (#2144)

Dmitri Tikhonov <notifications@github.com> Thu, 13 December 2018 17:27 UTC

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Subject: [quicwg/base-drafts] HTTP: Limit priority state before stream is opened (#2144)
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RFC 7540 [discusses priority state management](https://tools.ietf.org/html/rfc7540#section-5.3.4) at some length, especially what to do with priority information after a stream is closed.

In addition to this, in HTTP/3, we have to deal with priority information before a stream is opened. That is: just how large is the tree allowed to grow before the referenced streams' frames begin to come in?

The draft should provide some recommendations.

I can think of two ways to do limit this "front-loaded" state:
1. Open the stream with a _PRIORITY_ frame referencing it arrives on the control stream. This will invoke the stream limit checks.
2. Limit number of priority entries to number -- perhaps a function of the total number of maximum unidirectional and bidirectional streams.

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