Re: [hybi] Fwd: Web sockets and existing HTTP stacks
Greg Wilkins <gregw@webtide.com> Sat, 21 November 2009 00:26 UTC
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Date: Sat, 21 Nov 2009 11:26:32 +1100
From: Greg Wilkins <gregw@webtide.com>
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Subject: Re: [hybi] Fwd: Web sockets and existing HTTP stacks
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Jamie Lokier wrote: > The main spec editor believes WebSocket should intentionally fail when > encountering a proxy etc. and the web application should fall back to > some other method in that case, or simply not support those cases. > > Needless to say, several people take the opposite view, that it should > work over general HTTP infrastructure, but as that would make the > protocol more complicated and simplicity is also a goal, there is no > consensus. All, As an example of the problems resulting from this spec, I had some hassle implementing websocket support within the Jetty codebase. When processing headers of a response, jetty mostly encodes them directly into the output buffer as it iterates over them. However a few headers are held back until all the other headers have been processed as the values of other headers might influence the values imposed on transport headers. For example, the lack of a content-length header might mean that a "close" value needs to be added to the "Connection" header. Thus Jetty delays generation of the connection header until all the other headers have been processed. This means the for Jetty responses, the connection header is normally one of the last headers generated. Unfortunately this breaks the websocket specification, which insists on the Connection header being immediately after the Upgrade header and before the other WebSocket- headers I thus have had to put a special purpose hack in place deep in the HTTP generation code for jetty - to not delay Connection header handling if the response looks like a websocket upgrade response. Alternately I could refactor the generator to do two passes over the headers, or use a special purpose generator just for this response. However, it is my expectation that such special purpose hacks or refactoring of existing working code will result in far more breakage and security risks than any possible gain resulting from a strict adherence to header ordering. Existing HTTP code allows great flexibility in handling of headers and most code will be written with this assumption. Is there any consensus at all that strict header equivalence is a reasonable thing for this specification to have and is worth breaking the vast majority of existing HTTP code? regards
- Re: [hybi] Fwd: Web sockets and existing HTTP sta… Jamie Lokier
- Re: [hybi] Fwd: Web sockets and existing HTTP sta… Greg Wilkins
- [hybi] Fwd: Web sockets and existing HTTP stacks Christian Biesinger
- Re: [hybi] Fwd: Web sockets and existing HTTP sta… Jamie Lokier
- Re: [hybi] Fwd: Web sockets and existing HTTP sta… Christian Biesinger
- Re: [hybi] Fwd: Web sockets and existing HTTP sta… Greg Wilkins
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Ian Hickson
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Alexey Proskuryakov
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Greg Wilkins
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Greg Wilkins
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Justin Erenkrantz
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Jamie Lokier
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Justin Erenkrantz
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Jamie Lokier
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Mark Nottingham
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Greg Wilkins
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Ian Hickson
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Greg Wilkins
- Re: [hybi] [whatwg] Web sockets and existing HTTP… Pieter Hintjens
- Re: [hybi] Web sockets and existing HTTP stacks Ian Hickson
- Re: [hybi] Web sockets and existing HTTP stacks Justin Erenkrantz
- Re: [hybi] Web sockets and existing HTTP stacks Pieter Hintjens
- Re: [hybi] Web sockets and existing HTTP stacks Pieter Hintjens
- Re: [hybi] Web sockets and existing HTTP stacks L.Wood
- Re: [hybi] Web sockets and existing HTTP stacks Jamie Lokier
- Re: [hybi] Web sockets and existing HTTP stacks Jamie Lokier
- Re: [hybi] Web sockets and existing HTTP stacks Maciej Stachowiak
- Re: [hybi] Web sockets and existing HTTP stacks Justin Erenkrantz
- Re: [hybi] Web sockets and existing HTTP stacks SM
- Re: [hybi] Web sockets and existing HTTP stacks Mridul Muralidharan
- Re: [hybi] Web sockets and existing HTTP stacks Maciej Stachowiak
- Re: [hybi] Web sockets and existing HTTP stacks Mridul Muralidharan
- Re: [hybi] Web sockets and existing HTTP stacks Roberto Peon
- Re: [hybi] Web sockets and existing HTTP stacks Mark Nottingham
- Re: [hybi] Web sockets and existing HTTP stacks Pieter Hintjens
- Re: [hybi] Web sockets and existing HTTP stacks Mridul Muralidharan
- Re: [hybi] Web sockets and existing HTTP stacks Mridul Muralidharan
- Re: [hybi] Web sockets and existing HTTP stacks Jamie Lokier
- Re: [hybi] Web sockets and existing HTTP stacks Pieter Hintjens
- Re: [hybi] Web sockets and existing HTTP stacks Jamie Lokier
- Re: [hybi] Web sockets and existing HTTP stacks SM
- Re: [hybi] Web sockets and existing HTTP stacks Greg Wilkins
- [hybi] Sentinel framing. was: Web sockets and exi… Greg Wilkins
- Re: [hybi] Web sockets and existing HTTP stacks Greg Wilkins
- Re: [hybi] Web sockets and existing HTTP stacks Roberto Peon
- Re: [hybi] Web sockets and existing HTTP stacks Maciej Stachowiak
- Re: [hybi] Web sockets and existing HTTP stacks Roberto Peon
- Re: [hybi] Web sockets and existing HTTP stacks Francis Brosnan Blazquez
- Re: [hybi] Web sockets and existing HTTP stacks Maciej Stachowiak
- Re: [hybi] Web sockets and existing HTTP stacks Jamie Lokier
- Re: [hybi] Web sockets and existing HTTP stacks Jamie Lokier
- Re: [hybi] Web sockets and existing HTTP stacks Jamie Lokier
- Re: [hybi] Web sockets and existing HTTP stacks Jamie Lokier
- Re: [hybi] Web sockets and existing HTTP stacks Jamie Lokier
- Re: [hybi] Web sockets and existing HTTP stacks Jamie Lokier
- Re: [hybi] Web sockets and existing HTTP stacks Jamie Lokier
- Re: [hybi] Web sockets and existing HTTP stacks Greg Wilkins
- Re: [hybi] Web sockets and existing HTTP stacks Mridul Muralidharan
- Re: [hybi] Web sockets and existing HTTP stacks Mridul Muralidharan
- Re: [hybi] Web sockets and existing HTTP stacks Roberto Peon
- Re: [hybi] Web sockets and existing HTTP stacks Julian Reschke
- Re: [hybi] Web sockets and existing HTTP stacks Maciej Stachowiak
- Re: [hybi] Web sockets and existing HTTP stacks Roberto Peon
- Re: [hybi] Web sockets and existing HTTP stacks Maciej Stachowiak
- Re: [hybi] Web sockets and existing HTTP stacks Roberto Peon
- Re: [hybi] Web sockets and existing HTTP stacks Maciej Stachowiak
- Re: [hybi] Web sockets and existing HTTP stacks Vladimir Katardjiev
- Re: [hybi] Web sockets and existing HTTP stacks Greg Wilkins
- Re: [hybi] Web sockets and existing HTTP stacks Maciej Stachowiak