Handle a response from the client.

def _handle_response(self, msg_id, result=None, error=None):
        """Handle a response from the client."""
        request_future = self._server_request_futures.pop(msg_id, None)

        if not request_future:
            log.warn("Received response to unknown message id %s", msg_id)
            return

        if error is not None:
            log.debug("Received error response to message %s: %s", msg_id, error)
            request_future.set_exception(JsonRpcException.from_dict(error))

        log.debug("Received result for message %s: %s", msg_id, result)
        request_future.set_result(result)