class PreconditionRequiredHttpException

FlattenExceptionTest.php in drupal/core/vendor/symfony/debug/Symfony/Component/Debug/Tests/Exception/FlattenExceptionTest.php

class PreconditionRequiredHttpException extends HttpException {

  /**
   * Constructor.
   *
   * @param string     $message   The internal exception message
   * @param \Exception $previous  The previous exception
   * @param integer    $code      The internal exception code
   */
  public function __construct($message = null, \Exception $previous = null, $code = 0) {
    parent::__construct(428, $message, $previous, array(), $code);
  }

}