docs: def close(self):
          """
          Terminate the network connection to the remote end, if open.
  
          If no connection is open, this method does nothing.
  
          .. versionadded:: 2.0
          """
          if self.is_connected:
              self.client.close()
              if self.forward_agent and self._agent_handler is not None:
                  self._agent_handler.close()