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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\HttpKernel\Exception;
  13  
  14  /**
  15   * ServiceUnavailableHttpException.
  16   *
  17   * @author Ben Ramsey <ben@benramsey.com>
  18   */
  19  class ServiceUnavailableHttpException extends HttpException
  20  {
  21      /**
  22       * Constructor.
  23       *
  24       * @param int|string $retryAfter The number of seconds or HTTP-date after which the request may be retried
  25       * @param string     $message    The internal exception message
  26       * @param \Exception $previous   The previous exception
  27       * @param int        $code       The internal exception code
  28       */
  29      public function __construct($retryAfter = null, $message = null, \Exception $previous = null, $code = 0)
  30      {
  31          $headers = array();
  32          if ($retryAfter) {
  33              $headers = array('Retry-After' => $retryAfter);
  34          }
  35  
  36          parent::__construct(503, $message, $previous, $headers, $code);
  37      }
  38  }