public function bingVerifAction()
    {
        if ( !$this->getConfigResolver()->hasParameter( 'bing_verification', 'nova_ezseo' ) )
        {
            throw new NotFoundHttpException( "Bing Verification Key not found" );
        }

        $key = $this->getConfigResolver()->getParameter( 'bing_verification', 'nova_ezseo' );

        $xml = new DOMDocument("1.0", "UTF-8");
        $xml->formatOutput = true;

        $root = $xml->createElement("users");
        $root->appendChild($xml->createElement("user", $key));
        $xml->appendChild($root);

        $response = new Response($xml->saveXML());
        $response->setSharedMaxAge( 24 * 3600 );
        $response->headers->set("Content-Type", "text/xml");
        return $response;
    }