/**
  * Forward's the request to the configured error page.
  *
  * @param \AppserverIo\Psr\Servlet\Http\HttpServletRequestInterface  $servletRequest  The servlet request instance
  * @param \AppserverIo\Psr\Servlet\Http\HttpServletResponseInterface $servletResponse The servlet response instance
  *
  * @return void
  */
 protected function forwardToErrorPage(HttpServletRequestInterface $servletRequest, HttpServletResponseInterface $servletResponse)
 {
     // query whether or not we've an error page configured
     if ($formLoginConfig = $this->getConfigData()->getFormLoginConfig()) {
         if ($formErrorPage = $formLoginConfig->getFormErrorPage()) {
             // initialize the location to redirect to
             $location = $formErrorPage->__toString();
             if ($baseModifier = $servletRequest->getBaseModifier()) {
                 $location = $baseModifier . $location;
             }
             // redirect to the configured error page
             $servletRequest->setDispatched(true);
             $servletResponse->setStatusCode(307);
             $servletResponse->addHeader(Protocol::HEADER_LOCATION, $location);
             return;
         }
     }
     // redirect to the default error page
     $servletRequest->setAttribute(RequestHandlerKeys::ERROR_MESSAGE, 'Please configure a form-error-page when using auth-method \'Form\' in the login-config of your application\'s web.xml');
     $servletRequest->setDispatched(true);
     $servletResponse->setStatusCode(500);
 }