    public function testXForwarderForHeaderForForwardedRequests($xForwardedFor, $expected)
    {
        $this->setNextResponse();
        $server = array('REMOTE_ADDR' => '10.0.0.1');
        if (false !== $xForwardedFor) {
            $server['HTTP_X_FORWARDED_FOR'] = $xForwardedFor;
        }
        $this->request('GET', '/', $server);

        $this->assertEquals($expected, $this->kernel->getBackendRequest()->headers->get('X-Forwarded-For'));
    }
The product receives input or data, but it does
        not validate or incorrectly validates that the input has the
        properties that are required to process the data safely and
        correctly.