将cakephp应用程序移到新服务器后，响应头显示每个项目两次，例如两次。访问控制允许来源：*

我正在运行cakephp应用程序。以前在以前的服务器上运行正常。但是将应用程序移至新服务器后，应用程序将两次返回每个响应标头。

请查看带有响应标题的图片。

现在我不确定是什么原因？我没有在应用程序源代码中进行任何更改。 cakephp控制器具有与CORS相关的以下代码

public function beforeFilter() {

        parent::beforeFilter();

        header("Access-Control-Allow-Origin: *");
        header("Access-Control-Allow-Methods: POST, GET, OPTIONS, DELETE, PUT");
        header("Access-Control-Allow-Headers: x-requested-with, Content-Type, origin, authorization, accept, client-security-token");

        //////
        header('Cache-Control: no-store, private, no-cache, must-revalidate');                  // HTTP/1.1
        header('Cache-Control: pre-check=0, post-check=0, max-age=0, max-stale = 0', false);    // HTTP/1.1
        header('Pragma: public');
        header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');                                       // Date in the past  
        header('Expires: 0', false); 
        header('Last-Modified: '.gmdate('D, d M Y H:i:s') . ' GMT');
        header('Pragma: no-cache');
        //////

        $this->Auth->allow(array('api_testemail','api_settings','api_restaurantslistdp', 'api_userdetails', 'api_login','api_editprofile',
        'api_saveimage','api_removeitemsall','api_clearmemcache','api_getmemcachekeys','api_getmemcachestats',
        'api_getresmenu','api_displaycart','api_getsingleproduct','api_cart','api_removeitems',
        'api_increaseqty','api_decreaseqty','api_getsingleaddress','api_deleteaddress','api_promocode',
        'api_checkrestaurant','api_nearestofferbyadd','api_restaurantslistbyaddb','api_checkprinterstatus','api_versioncheck','api_getprinterstatusfromiconnectbulk'));

    }

我已经尝试通过从此处删除php header（）行来查看它是否创建重复条目。但没有运气。一直以来，我都在响应头中加倍加倍，导致在Android应用程序中出现以下错误：

Access to XMLHttpRequest at 'http://example.com/backend/api/mobile/login' from origin 'http://localhost:8100' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values '*, *', but only one is allowed.

谁能帮帮我吗？