mod_unsubscriber: Add MUC support This catches XEP-0045 Join stanzas and replies with an error telling the prospective participant that the supposed MUC is gone. The user or their client can then take action to remove any bookmark or at least disable autojoin.

This module produces more detailed HTTP logs for Prosodys built-in HTTP
server. The format is similar to that of Apache and go into Prosodys
normal logs at the `info` level.