code: def _verify_state(self, resp, state_data, state):
          
          is_known_state = "state" in resp and "state" in state_data and resp["state"] == state_data["state"]
          if not is_known_state:
              received_state = resp.get("state", "")
              satosa_logging(logger, logging.DEBUG,
                             "Missing or invalid state [%s] in response!" % received_state, state)
              raise SATOSAAuthenticationError(state,
                                              "Missing or invalid state [%s] in response!" %
                                              received_state)
docs: Will verify the state and throw and error if the state is invalid.
          :type resp: AuthorizationResponse
          :type state_data: dict[str, str]
          :type state: satosa.state.State
  
          :param resp: The authorization response from the AS, created by pyoidc.
          :param state_data: The state data for this backend.
          :param state: The current state for the proxy and this backend.
          Only used for raising errors.