Re: Design Issue: Separate HEADERS and PRIORITY Frames, Eliminate HEADERS+PRIORITY
James M Snell <jasnell@gmail.com> Tue, 21 May 2013 16:38 UTC
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From: James M Snell <jasnell@gmail.com>
Date: Tue, 21 May 2013 09:37:27 -0700
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To: "William Chan (陈智昌)" <willchan@chromium.org>
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Subject: Re: Design Issue: Separate HEADERS and PRIORITY Frames, Eliminate HEADERS+PRIORITY
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Honestly, there's no rush on it. All I am doing at this point is documenting the proposal so it can be tracked and ultimately addressed at some later point in the process. On Tue, May 21, 2013 at 9:32 AM, William Chan (陈智昌) <willchan@chromium.org> wrote: > We discussed this previously and Roberto and I were both against the removal > of the priority field from the HEADERS+PRIORITY frame: > http://lists.w3.org/Archives/Public/ietf-http-wg/2013JanMar/1065.html, even > considering stream reprioritization. > > I support adding a new additional PRIORITY frame for stream > reprioritization. That said, I'm in no hurry to write anything into the > spec. On the SPDY end we're planning on experimenting with prioritization > and when we have something to present with detailed explanations why, we > will do so. We presented the general ideas previously in the last interim > meeting and haven't finished implementation and experimentation. > > Unless there's a reason this needs to be in the current http/2 draft sooner > rather than later, I'd rather punt on this discussion until we have > implementation experience that can guide this debate. I believe everyone > recognizes that people are interested in reprioritization. If we need to put > something in the spec, let's just add a new frame and then revisit changing > HEADERS+PRIORITY later. > > > On Tue, May 21, 2013 at 1:10 PM, James M Snell <jasnell@gmail.com> wrote: >> >> https://github.com/http2/http2-spec/issues/99 >> >> With regards to the discussion over stream re-prioritization, I suggest: >> >> 1. Drop the HEADERS+PRIORITY frame type. >> 2. Create a new separate PRIORITY frame type whose payload is the >> Priority value, no frame-specific flags. >> 3. The PRIORITY frame becomes the only way to set/change the priority >> for a stream. >> >> If it is necessary to allow an endpoint to establish the priority of >> stream prior to actually initiating the stream, we can allow sending a >> PRIORITY frame before the initial HEADERS frame. Doing so would >> effectively reserve the stream id (in the same general manner >> PUSH_PROMISE does). >> >> The advantages of this approach are: >> >> 1. It eliminates any possible confusion and complexity about when to >> use HEADERS+PRIORITY vs. HEADERS >> 2. It provides a single way of setting/change stream priority (as >> opposed to using HEADERS+PRIORITY plus a separate CHANGE-PRIORITY >> frame) >> >
- Design Issue: Separate HEADERS and PRIORITY Frame… James M Snell
- Re: Design Issue: Separate HEADERS and PRIORITY F… Roberto Peon
- Re: Design Issue: Separate HEADERS and PRIORITY F… William Chan (陈智昌)
- Re: Design Issue: Separate HEADERS and PRIORITY F… James M Snell
- Re: Design Issue: Separate HEADERS and PRIORITY F… James M Snell
- Re: Design Issue: Separate HEADERS and PRIORITY F… William Chan (陈智昌)
- Re: Design Issue: Separate HEADERS and PRIORITY F… Patrick McManus
- Re: Design Issue: Separate HEADERS and PRIORITY F… William Chan (陈智昌)
- Re: Design Issue: Separate HEADERS and PRIORITY F… James M Snell
- Re: Design Issue: Separate HEADERS and PRIORITY F… Roberto Peon
- Re: Design Issue: Separate HEADERS and PRIORITY F… James M Snell
- Re: Design Issue: Separate HEADERS and PRIORITY F… Jeff Pinner
- Re: Design Issue: Separate HEADERS and PRIORITY F… Roberto Peon
- Re: Design Issue: Separate HEADERS and PRIORITY F… Jeff Pinner
- Re: Design Issue: Separate HEADERS and PRIORITY F… Roberto Peon
- Re: Design Issue: Separate HEADERS and PRIORITY F… Jeff Pinner
- Re: Design Issue: Separate HEADERS and PRIORITY F… Roberto Peon
- Re: Design Issue: Separate HEADERS and PRIORITY F… Patrick McManus
- Re: Design Issue: Separate HEADERS and PRIORITY F… Jeff Pinner
- Re: Design Issue: Separate HEADERS and PRIORITY F… Roberto Peon
- Re: Design Issue: Separate HEADERS and PRIORITY F… Jeff Pinner
- Re: Design Issue: Separate HEADERS and PRIORITY F… Jeff Pinner
- Re: Design Issue: Separate HEADERS and PRIORITY F… James M Snell
- Re: Design Issue: Separate HEADERS and PRIORITY F… Martin Thomson
- Re: Design Issue: Separate HEADERS and PRIORITY F… Jeff Pinner
- Re: Design Issue: Separate HEADERS and PRIORITY F… William Chan (陈智昌)
- Re: Design Issue: Separate HEADERS and PRIORITY F… Roberto Peon
- Re: Design Issue: Separate HEADERS and PRIORITY F… Jeff Pinner
- Re: Design Issue: Separate HEADERS and PRIORITY F… Roberto Peon
- Re: Design Issue: Separate HEADERS and PRIORITY F… William Chan (陈智昌)