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

James M Snell <jasnell@gmail.com> Sat, 27 April 2013 20:32 UTC

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From: James M Snell <jasnell@gmail.com>
Date: Sat, 27 Apr 2013 13:31:47 -0700
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To: Martin Thomson <martin.thomson@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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Ok, I have a pending push request that addresses these items.

On Fri, Apr 26, 2013 at 11:38 AM, Martin Thomson
<martin.thomson@gmail.com>; wrote:
> 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.