symfony 2.0.22 request header null

Question

I was working with symfony 2.0.12 but I have this problem: the page is not updated, always returns null.

public function cambiarlocaleAction($idioma)
{
    $this->get('session')->setLocale($idioma);
    $request = $this->get('request');
    return new Response ($request->headers->get('referer'));
    return $this->redirect($request->headers->get('referer'));
}

$request->headers->get('referer') always null why? in symfony 2.0.14 work.

Answer 1

There is no guarantee the header referer is sent with the request. Typically if the user enters the URL directly, it's not present (and therefore if you try to retrieve it, the result is null). Even when user is following a link the browser is not obligated to send that header.