Generate new CSRF token without reloading the entire form

Question

If a user gets logged out (due to session expiration or for other reasons) in the background while using my Symfony2 application, I have implemented a JS layer appearing on

Answer 1

Use this to regenerate CSRF token (Since Symfony2.4):

$csrf = $this->get('security.csrf.token_manager'); //Symfony\Component\Security\Csrf\CsrfTokenManagerInterface
$token = $csrf->refreshToken($intention); // Intention is specified in form type

return new Response($token);