docs: def connect(self, frame, response=None):
          """
          Handle CONNECT command: Establishes a new connection and checks auth (if applicable).
          """
          self.engine.log.debug("CONNECT")
  
          if self.engine.authenticator:
              login = frame.headers.get('login')
              passcode = frame.headers.get('passcode')
              if not self.engine.authenticator.authenticate(login, passcode):
                  raise AuthError("Authentication failed for %s" % login)
  
          self.engine.connected = True
  
          response = response or Frame(frames.CONNECTED)
          response.headers['session'] = uuid.uuid4()
  
          # TODO: Do we want to do anything special to track sessions?
          # (Actually, I don't think the spec actually does anything with this at all.)
          self.engine.connection.send_frame(response)