HttpSocket in Ajax

I'm having promlem with sending post request in ajax request handler. In ajax request handler the body of response is always null, in the regular request handler it's not null. How to send http requests in ajax request handler?

class DataController extends AppController
{
    public function ajax_get_name()
    {
        $this->layout = 'ajax';
        $http = new HttpSocket();
        $res = $http->get('http://www.google.com/search', 'q=cakephp');
        if($res)
        {
            $data = json_decode($res->body);
            debug($data); // null
        }
    }

    publiс function index()
    {
                $http = new HttpSocket();
        $res = $http->get('http://www.google.com/search', 'q=cakephp');
        if($res)
        {
            $data = json_decode($res->body);
            debug($data); // not null
        }
    }
}

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