[@Secure feature] redirect response should use _format from parent request #5080
Description
Suggestion.
Redirect response to login route should use _format parameter from parent request when this parameter is part of the login route.
I could use this workaround, or create special listener class, but I'm sure it should be done by symfony itself.
// workaround for every route which uses non default format
if (!$this->get('security.context')->isGranted('ROLE_USER')) {
$pars = $this->getRequest()->attributes->get('_route_params');
return new RedirectResponse($this->generateUrl('login', array('_format' => $pars['_format'])));
}