[jdev] Digest URIs for XMPP

[Kurt Zeilenga]

I think clients ought to simply assert xmpp/host where host is  
whatever string the user specified to connect to.

But more importantly is what should the server do.  RFC 2831 says:
    Servers SHOULD check that the supplied value is correct. This will
    detect accidental connection to the incorrect server. It is also so
    that clients will be trained to provide values that will work with
    implementations that use a shared back-end authentication service
    that can provide server authentication.

I suggest instead:
    Servers SHOULD ignore that the supplied value.  The check
    was intended to detect that client did not accidentally
    connect to the incorrect server.  Performing the check will far more
    likely lead to disconnecting of clients which did connect to the
    correct server than disconnecting clients which accidentally  
connected
    to an incorrect server.

Such checks tend to make the application services brittle.   (Consider  
the implications of forward and reverse NAT devices, transparent (to  
the client and server) tunneling, etc.)

-- Kurt