Re: Design Issue: Merge RST_STREAM and GOAWAY into a single ERROR frame type
James M Snell <jasnell@gmail.com> Fri, 03 May 2013 21:09 UTC
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From: James M Snell <jasnell@gmail.com>
Date: Fri, 03 May 2013 14:08:38 -0700
Message-ID: <CABP7RbcTbFxNj-qax1An0Qp7okWqvbt5MTXyHZTMn_fBKgx9Fw@mail.gmail.com>
To: "William Chan (陈智昌)" <willchan@chromium.org>
Cc: Jeff Pinner <jpinner@twitter.com>, "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
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Subject: Re: Design Issue: Merge RST_STREAM and GOAWAY into a single ERROR frame type
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There is no bikeshedding going on at all. I made the motivation for this clear up front: it's a simplification that addresses three specific items. Note: there is an existing editorial note in the existing draft that calls out the fact that we have no non-terminal method of communicating non-stream related errors. If we can address that item while also simplifying things a bit, then fantastic. On Fri, May 3, 2013 at 2:01 PM, William Chan (陈智昌) <willchan@chromium.org> wrote: > This is a thread ripe for bikeshedding. Is there any major issue worth > solving? > > If we're going to paint our bike sheds, my take is keep whatever color the > bike shed already has unless it really offends a number of people. > > > On Fri, May 3, 2013 at 5:53 PM, James M Snell <jasnell@gmail.com> wrote: >> >> Speaking candidly, if we find ourselves requiring more than 8 boolean >> flags on an error frame we should all just quit and go home. >> >> On Fri, May 3, 2013 at 1:34 PM, Jeff Pinner <jpinner@twitter.com> wrote: >> > IIRC, when this was brought up at the last F2F the rational for NOT >> > doing >> > this was that frame types were cheaper than flags (256 frame types, 8 >> > flags). >> > >> > That being said I think we should consider combining them :) >> > >> > >> > On Fri, May 3, 2013 at 1:04 PM, James M Snell <jasnell@gmail.com> wrote: >> >> >> >> As a simplification, I'd like to suggest that we merge the RST_STREAM >> >> and GOAWAY frames into a single ERROR frame with the following >> >> definition: >> >> >> >> 0 1 2 3 >> >> 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 >> >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> >> | Error Code (32) | >> >> +---------------------------------------------------------------+ >> >> |X| Last-Stream-ID (31) | >> >> +-+-------------------------------------------------------------+ >> >> >> >> (note that this flips the field order from the GOAWAY frame) >> >> >> >> A frame-specific GOAWAY flag bit (0x2) would be defined for the frame, >> >> and the Last-Stream-ID field would only be included in the frame data >> >> if this flag was set. >> >> >> >> This does a couple of things for us: >> >> >> >> 1. It simplifies the error handling and reduces the number of core >> >> frame >> >> types. >> >> 2. It allows us to terminate a stream and terminate the session in a >> >> single frame if necessary >> >> 3. It gives us a way of reporting non-terminal session errors >> >> (currently RST_STREAM is forbidden to use stream id #0 and GOAWAY is >> >> always terminal). >> >> >> > >> >
- Design Issue: Merge RST_STREAM and GOAWAY into a … James M Snell
- Re: Design Issue: Merge RST_STREAM and GOAWAY int… Jeff Pinner
- Re: Design Issue: Merge RST_STREAM and GOAWAY int… James M Snell
- Re: Design Issue: Merge RST_STREAM and GOAWAY int… William Chan (陈智昌)
- Re: Design Issue: Merge RST_STREAM and GOAWAY int… James M Snell
- Re: Design Issue: Merge RST_STREAM and GOAWAY int… William Chan (陈智昌)
- Re: Design Issue: Merge RST_STREAM and GOAWAY int… Roberto Peon
- Re: Design Issue: Merge RST_STREAM and GOAWAY int… James M Snell
- Re: Design Issue: Merge RST_STREAM and GOAWAY int… William Chan (陈智昌)
- Re: Design Issue: Merge RST_STREAM and GOAWAY int… James M Snell
- Re: Design Issue: Merge RST_STREAM and GOAWAY int… Patrick McManus