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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_Json
  * @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    $Id$
  */
 
 /**
  * @see Zend_Json_Server_Response
  */
 // require_once 'Zend/Json/Server/Response.php';
 
 /**
  * @category   Zend
  * @package    Zend_Json
  * @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_Json_Server_Response_Http extends Zend_Json_Server_Response
 {
     /**
      * Emit JSON
      *
      * Send appropriate HTTP headers. If no Id, then return an empty string.
      *
      * @return string
      */
     public function toJson()
     {
         $this->sendHeaders();
         if (!$this->isError() && null === $this->getId()) {
             return '';
         }
 
         return parent::toJson();
     }
 
     /**
      * Send headers
      *
      * If headers are already sent, do nothing. If null ID, send HTTP 204
      * header. Otherwise, send content type header based on content type of
      * service map.
      *
      * @return void
      */
     public function sendHeaders()
     {
         if (headers_sent()) {
             return;
         }
 
         if (!$this->isError() && (null === $this->getId())) {
             header('HTTP/1.1 204 No Content');
             return;
         }
 
         if (null === ($smd = $this->getServiceMap())) {
             return;
         }
 
         $contentType = $smd->getContentType();
         if (!empty($contentType)) {
             header('Content-Type: ' . $contentType);
         }
     }
 }