code: def log(self, format_, args, level=logging.INFO):
          
          self.server.listener.logger.log(level, format_, *args)
docs: This function is called for anything that needs to get logged.
          It logs to the logger of this listener.
  
          It is not defined in the standard handler class; our version
          has an additional `level` argument that allows to control the
          logging level in the standard Python logging support.
  
          Another difference is that the variable arguments are passed
          in as a tuple.