private function restoreResponseBody(Request $request, Response $response)
    {
        if ($response->headers->has('X-Body-Eval')) {
            ob_start();

            if ($response->headers->has('X-Body-File')) {
                include $response->headers->get('X-Body-File');
            } else {
                eval('; ?>'.$response->getContent().'<?php ;');
            }

            $response->setContent(ob_get_clean());
            $response->headers->remove('X-Body-Eval');
            if (!$response->headers->has('Transfer-Encoding')) {
                $response->headers->set('Content-Length', \strlen($response->getContent()));
            }
        } elseif ($response->headers->has('X-Body-File')) {
            // Response does not include possibly dynamic content (ESI, SSI), so we need
            // not handle the content for HEAD requests
            if (!$request->isMethod('HEAD')) {
                $response->setContent(file_get_contents($response->headers->get('X-Body-File')));
            }
        } else {
            return;
        }

        $response->headers->remove('X-Body-File');
    }