Re: [quicwg/base-drafts] Allow not creating QPACK codec streams (#2529)

Lucas Pardue <> Thu, 21 March 2019 19:23 UTC

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From: Lucas Pardue <>
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Subject: Re: [quicwg/base-drafts] Allow not creating QPACK codec streams (#2529)
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LPardue commented on this pull request.

>  HTTP_WRONG_STREAM_COUNT. These streams MUST NOT be closed. Closure of either
 unidirectional stream type MUST be treated as a connection error of type
+An endpoint MAY avoid creating its own encoder stream if the maximum size of
+the dynamic table permitted by the peer is zero.
+An endpoint MAY avoid creating its own decoder stream if the maximum size of
+its own dynamic table is zero.
+An endpoint MUST allow its peer to create both encoder and decoder streams

Thinking about this a little more, its a nice feature of HPACK that it can chose when to start using dynamic compression, with little overhead. 

My understanding though is that we can't use MAX_STREAMS to contorl concurrency like you describe (I'm probably wrong here). But from the transport document section 19.11

> Note that these frames (and the corresponding transport parameters)
   do not describe the number of streams that can be opened
   concurrently.  The limit includes streams that have been closed as
   well as those that are open.

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