Re: Design Issue: Which frames are allowed to reference Stream ID #0 and which aren't?

Martin Thomson <martin.thomson@gmail.com> Fri, 26 April 2013 18:39 UTC

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Date: Fri, 26 Apr 2013 11:38:59 -0700
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From: Martin Thomson <martin.thomson@gmail.com>
To: James M Snell <jasnell@gmail.com>
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Subject: Re: Design Issue: Which frames are allowed to reference Stream ID #0 and which aren't?
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On 26 April 2013 11:28, James M Snell <jasnell@gmail.com>; wrote:
> One can look at the various frame types and determine which are
> obviously intended for use with streams and which are for the session
> but we need to be clear on exactly what happens when various types of
> frames reference Stream ID #0.
>
> For instance, if a DATA frame reference Stream ID #0, I would say that
> the result MUST be a protocol error. (Likewise with HEADERS frames)

DATA on stream 0 is an error, we need to make that clear.

> Likewise, what exactly does it mean for a PING Frame to specify a
> Stream Identifier? Or are all PING Frames required to use Stream ID
> #0?

PING on non-stream 0 is an error.  The problem there is that PING
demands a PONG and you cannot know whether it is possible for the peer
to do that.