Sending empty arrays with jquery to Symfony

Sending empty arrays with jquery to Symfony.js

$.ajax({
                url:postURL,
                type:"POST",
                data:JSON.stringify(data),
                contentType:"application/json; charset=utf-8",
                dataType:"json"
            })

server.php

public function yourAction()
{
            $requestContent = $request->getContent();

            if (
                0 !== strpos($request->headers->get('Content-Type'), 'application/json') ||
                empty($requestContent)
            ) {
                throw new \Exception("Invalid request format.");
            }

            $config = json_decode($requestContent, true);
            $config = is_array($config) ? $config : array();
}

silex.txt

http://silex.sensiolabs.org/doc/cookbook/json_request_body.html