Symfony 2 Previous URL

Question

How to check in symfony2 controller previous URL, like in symfony 1.x ? Something equivalent to:

$request->getReferer();

Answer 1

To check controller previous URL in symfony 2 :

$this->getRequest()->headers->get('referer')

Answer 2

In new version of symfony the request object should be injected!

public function show(Request $request)
{
        $request->headers->get('referer');
        //...
}