Contao\CoreBundle\EventListener\ExceptionConverterListener::convertToHttpException PHP Method

    private function convertToHttpException(\Exception $exception, $target)
    {
        switch ($target) {
            case 'AccessDeniedHttpException':
                return new AccessDeniedHttpException($exception->getMessage(), $exception);
            case 'InternalServerErrorHttpException':
                return new InternalServerErrorHttpException($exception->getMessage(), $exception);
            case 'NotFoundHttpException':
                return new NotFoundHttpException($exception->getMessage(), $exception);
            case 'ServiceUnavailableHttpException':
                return new ServiceUnavailableHttpException(null, $exception->getMessage(), $exception);
        }
        return null;
    }