/**
  *	Display an error page on invalid request.
  *
  *	@parameter <{ERROR_CODE}> integer
  *	@parameter <{ERROR_MESSAGE}> string
  */
 public function httpError($code, $message = null)
 {
     // Determine the error page for the given status code.
     $errorPages = ErrorPage::get()->filter('ErrorCode', $code);
     // Allow extension customisation.
     $this->extend('updateErrorPages', $errorPages);
     // Retrieve the error page response.
     if ($errorPage = $errorPages->first()) {
         Requirements::clear();
         Requirements::clear_combined_files();
         $response = ModelAsController::controller_for($errorPage)->handleRequest(new SS_HTTPRequest('GET', ''), DataModel::inst());
         throw new SS_HTTPResponse_Exception($response, $code);
     } else {
         if (file_exists($cachedPage = ErrorPage::get_filepath_for_errorcode($code, class_exists('Translatable') ? Translatable::get_current_locale() : null))) {
             $response = new SS_HTTPResponse();
             $response->setStatusCode($code);
             $response->setBody(file_get_contents($cachedPage));
             throw new SS_HTTPResponse_Exception($response, $code);
         } else {
             return parent::httpError($code, $message);
         }
     }
 }