在Cakephp 2中没有检测到跨域ajax请求

Question

如何在Cakephp 2.7中检测跨域ajax请求。

我正在将来自我的一个域的请求发送到另一个域。

jQuery Aajx：来自我的一个域名http：// firstdomain.com

 $.ajax({
            type: 'post',
            url: 'http://anotherdomain.com/users/profile/' + id,
            data: formData,
            dataType: 'json',
            //crossDomain: true,
            headers: {'X-Requested-With': 'XMLHttpRequest'}
            success: function(result) {


            }
    });

CakePHP控制器到我的另一个域安装了ssl的https：// anotherdomain.com

App::uses('AppController', 'Controller');

header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST, GET, OPTIONS');
header('Access-Control-Max-Age: 1000');
header('Access-Control-Allow-Headers: Content-Type');

class UsersController extends AppController {

    public $helpers = array('Html', 'Form', 'Session', 'Js', 'Paginator');
    public $components = array('Email', 'RequestHandler');

    public function beforeFilter() {
        parent::beforeFilter();
    }


    public function profile($id) {
        //$this->request->onlyAllow('ajax'); // No direct access via browser URL
        $this->layout = false;
        $this->autoRender = false;

        echo $this->request->is('ajax'); die; //no output here. but $this->request->is('post') true

    }
}