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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Amf
  * @subpackage Response
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /** Zend_Amf_Response */
 // require_once 'Zend/Amf/Response.php';
 
 /**
  * Creates the proper http headers and send the serialized AMF stream to standard out.
  *
  * @package    Zend_Amf
  * @subpackage Response
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Amf_Response_Http extends Zend_Amf_Response
 {
     /**
      * Create the application response header for AMF and sends the serialized AMF string
      *
      * @return string
      */
     public function getResponse()
     {
         if (!headers_sent()) {
             if ($this->isIeOverSsl()) {
                 header('Cache-Control: cache, must-revalidate');
                 header('Pragma: public');
             } else {
                 header('Cache-Control: no-cache, must-revalidate');
                 header('Pragma: no-cache');
             }
             header('Expires: Thu, 19 Nov 1981 08:52:00 GMT');
             header('Content-Type: application/x-amf');
         }
         return parent::getResponse();
     }
 
     protected function isIeOverSsl()
     {
         $ssl = isset($_SERVER['HTTPS']) ? $_SERVER['HTTPS'] : false;
         if (!$ssl || ($ssl == 'off')) {
             // IIS reports "off", whereas other browsers simply don't populate
             return false;
         }
 
         $ua  = $_SERVER['HTTP_USER_AGENT'];
         if (!preg_match('/; MSIE \d+\.\d+;/', $ua)) {
             // Not MicroSoft Internet Explorer
             return false;
         }
 
         return true;
     }
 }