It has some problems forwarding cookies between servers when forwarding requests, but I can't track down exactly in what cases. A quick scan of their code shows that they really don't know what they're doing as far as headers that repeat multiple times (as cookie headers can). Also, they have a section in their session code that talks about cookies repeating multiple times and saying, "this won't work if multiple cookies are present, but it works in mozilla M18... let's hope everybody behaves like that". *sigh*
Anybody know mod_backhand? Anybody want to fix it? Anybody want to start a discussion on the mailing list about this issue?
I'm going to bed. More debugging tomorrow night.