Symfony AccessDeniedHttpException return 302 code

On a Symfony project, I would return sometime an access denied Exception (403 code). I am doing this through Ajax. But the Exception return a 302 code with the FOS Bundle login page in location.

I isolated the issue on a test function and a test ajax:

PHP

  /**
     * @Route("/test")
     * @Method("POST")
     */
     public function testAction() {
        throw $this->createAccessDeniedException();
     }

JS

$.post('/test');

This Ajax call return a 302 code and redirect to login page (in response)

How can I solve this "bug"?

EDIT

I add the security.yml

main:
        pattern:        ^/
        anonymous:      true
        provider:       main
        form_login:
            login_path: fos_user_security_login
            check_path: fos_user_security_check
        logout:
            path:       fos_user_security_logout
            target:     /
        remember_me:
            secret:        %secret%

Thanks in advance