I'm using wkhtmltopdf to generate a pdf report in my application,but when the pdf is generated,i got the login page in the pdf.

this is my Action:

public function exportPdfAction($id = 0)
{
    $em = $this->container->get('doctrine')->getEntityManager();
    $id = $this->get('request')->get($this->admin->getIdParameter());
    $object = $this->admin->getObject($id);

    if (!$object) {
        throw new NotFoundHttpException(sprintf('unable to find the object with id : %s', $id));
    }

    if (false === $this->admin->isGranted('VIEW', $object)) {
        throw new AccessDeniedException();
    }

    $pageUrl = $this->generateUrl('admin_rh_leave_conge_show', array('id'=>$id), true); // use absolute path!

     return new Response(
        $this->get('knp_snappy.pdf')->getOutput($pageUrl),
        200,
        array(
            'Content-Type'          => 'application/pdf',
            'Content-Disposition'   => 'attachment; filename="Fiche_conge.pdf"'

        )
    );
}

how can i resolve the problem ?

this is a bit late, but I had the exact same problem, and found a solution for it: You can pass in options as second parameter in the getOutput()-method. One of these options is cookie:

use Symfony\Component\HttpFoundation\Response;
...

$session = $this->get('session');
$session->save();
session_write_close();

return new Response(
    $this->get('knp_snappy.pdf')->getOutput(
        $pageUrl,
        array('cookie' => array($session->getName() => $session->getId()))
    ),
    200,
    array(
        'Content-Type' => 'application/pdf',
    )
);

See https://code.google.com/p/wkhtmltopdf/issues/detail?id=356 and https://github.com/KnpLabs/KnpSnappyBundle/issues/42 for details.