Re: [hybi] first draft of WS mux extension

[Tobias Oberstein <[e-mail]>]

> Your intermediary example doesn't work IMHO. Right now, if the
> intermediary doesn't understand the mux extension it MUST fail the
> connection. If the base protocol is unchanged then the intermediary can

Why must it fail?

"""
An intermediary might coalesce and/or split frames, if no
extensions were negotiated by the client and the server, or if some
extensions were negotiated, but the intermediary understood all the
extensions negotiated and knows how to coalesce and/or split frames
in presence of these extensions.
"""

"""
An intermediary MUST NOT change the fragmentation of any message
in the context of a connection where extensions have been
negotiated and the intermediary is not aware of the semantics of
the negotiated extensions.
"""

So when the intermediary does not understand the mux extension,
it MUST NOT change fragmentation.

Where does the spec say it MUST fail?

It may of course, due to local policy .. like "we don't allow any WS extension".