Section 11.3.2 of WebSocket specification says that Sec-WebSocket-Extensions header field must not appear more than once in an HTTP response.
Created attachment 199518 [details] Patch Proposed patch
Comment on attachment 199518 [details] Patch Clearing flags on attachment: 199518 Committed r149120: <http://trac.webkit.org/changeset/149120>
All reviewed patches have been landed. Closing bug.