code: protected void createGatewayRequestCheckDecisionState(final Flow flow) {
          createDecisionState(flow, CasWebflowConstants.STATE_ID_GATEWAY_REQUEST_CHECK,
              "requestParameters.gateway != '' and requestParameters.gateway != null and flowScope.service != null",
              CasWebflowConstants.STATE_ID_GATEWAY_SERVICES_MGMT_CHECK,
              CasWebflowConstants.STATE_ID_SERVICE_AUTHZ_CHECK);
      }
docs: Create gateway request check decision state.
  
  @param flow the flow