Re: Design Issue: HEADERS+PRIORITY "MUST be used" for each stream that is created??
James M Snell <jasnell@gmail.com> Fri, 26 April 2013 20:55 UTC
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From: James M Snell <jasnell@gmail.com>
Date: Fri, 26 Apr 2013 13:54:16 -0700
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To: Martin Thomson <martin.thomson@gmail.com>
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Subject: Re: Design Issue: HEADERS+PRIORITY "MUST be used" for each stream that is created??
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Well, until that case is made, we don't have very many good reasons to allow DATA frames with preceding headers-bearing frames. Also, keep in mind that it's perfectly legal to send a HEADERS frame with an empty set of HEADERS. It the WebSockets case does not require any preceding headers (which I rather doubt), it would still be simple enough to send an empty HEADERS frame to establish the stream before sending the DATA frames. On Fri, Apr 26, 2013 at 1:49 PM, Martin Thomson <martin.thomson@gmail.com> wrote: > On 26 April 2013 13:43, James M Snell <jasnell@gmail.com> wrote: >> I think I disagree on that point and say that I think it's much safer >> if we require that streams be initiated with only headers-bearing >> frames. >> >> Imagine, for instance, that a sender sends along a DATA frame with a >> new, previously unused stream identifier. Without an associated >> headers frame I have absolutely no context with which to determine >> what I need to do with that DATA frame. Likewise if I receive an >> RST_STREAM that references a previously unused stream identifier. If >> there's absolutely nothing that I can reliably do with it, or not >> reliable way that I can interpret it without additional context, then >> we should not allow it. > > I believe that this is exactly the scenario that the websockets > binding will take advantage of. (Maybe there is some need to expose > some header information there, but that's a case that needs to be made > for that specific use of the framing layer.)
- Design Issue: HEADERS+PRIORITY "MUST be used" for… James M Snell
- Re: Design Issue: HEADERS+PRIORITY "MUST be used"… Martin Thomson
- Re: Design Issue: HEADERS+PRIORITY "MUST be used"… James M Snell
- Re: Design Issue: HEADERS+PRIORITY "MUST be used"… Martin Thomson
- Re: Design Issue: HEADERS+PRIORITY "MUST be used"… James M Snell
- Re: Design Issue: HEADERS+PRIORITY "MUST be used"… Roberto Peon
- Re: Design Issue: HEADERS+PRIORITY "MUST be used"… James M Snell
- Re: Design Issue: HEADERS+PRIORITY "MUST be used"… William Chan (陈智昌)