[whatwg] Why deflate-stream is required to be enabled by the WebSocket API?

Adam Barth w3c at adambarth.com
Wed Jul 20 17:13:56 PDT 2011

On Wed, Jul 20, 2011 at 4:56 PM, Bjoern Hoehrmann <derhoermi at gmx.net> wrote:
> * Adam Barth wrote:
>>On Wed, Jul 20, 2011 at 11:49 AM, Bjoern Hoehrmann <derhoermi at gmx.net> wrote:
>>> The deflate-stream extension, when used for browser to server messages
>>> allows an attacker to put whatever bytes he likes on the wire, after a
>>> bit of unpredictable junk. Browser vendors were pretty opposed to that
>>> for the normal protocol without extensions, and they were opposed to
>>> having some way to make browsers send messages "unmasked"; so it would
>>> be very odd for browser vendors to implement the extension. And by the
>>> looks of it, the hybi Working Group may well drop deflate-stream now.
>>> See <http://www.ietf.org/mail-archive/web/hybi/current/msg07093.html>
>>> and <http://www.ietf.org/mail-archive/web/hybi/current/msg07581.html>.
>>Isn't the obvious solution to both problems to apply compression before masking?
> There is draft-tyoshino-hybi-websocket-perframe-deflate for that. It's
> not a solution to the problem Takeshi Yoshino raised though, which is
> about whether Websocket API conformance should impose restrictions on
> which Websocket extensions must and must not be supported, as far as I
> understand it anyway.

It seems pretty clear that the API specify whatever profile of the
protocol we choose.  We do the same thing with HTTP (e.g., with the
XMLHttpRequest API).


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