RE: digest-md5 realm

["Paul Leach (Exchange)" <paulle@xxxxxxxxxxxxxxxxxxxxxx>]

No realm in digest-response means to use the empty string in the calculation
of the hash.

If the server does not hold the empty string realm, then it MAY send a list
of the realms it does hold. However, the empty string realm is no different
in this respect than any other realm -- if the server does not send a list
of realms, then the client could choose a realm that the server doesn't
hold, in which case the authentication will just fail.

Paul