code: private AttachInternetGatewayResponseType attachInternetGateway(final String internetgatewayId,
              final String vpcId) {
          AttachInternetGatewayResponseType ret = new AttachInternetGatewayResponseType();
          ret.setRequestId(UUID.randomUUID().toString());
          mockInternetGatewayController.attachInternetGateway(internetgatewayId, vpcId);
          ret.setReturn(true);
          return ret;
      }
docs: Handles "deleteInternetGateway" request to delete InternetGateway and returns response with a InternetGateway.
  @param internetgatewayId : Internet Gateway Id.
  @param vpcId : vpc Id.
  @return a DeleteInternetGatewayResponseType with InternetGateway.