Symfony\Component\HttpFoundation\Request::duplicate PHP Method

    public function duplicate(array $query = null, array $request = null, array $attributes = null, array $cookies = null, array $files = null, array $server = null)
    {
        $dup = clone $this;
        if ($query !== null) {
            $dup->query = new ParameterBag($query);
        }
        if ($request !== null) {
            $dup->request = new ParameterBag($request);
        }
        if ($attributes !== null) {
            $dup->attributes = new ParameterBag($attributes);
        }
        if ($cookies !== null) {
            $dup->cookies = new ParameterBag($cookies);
        }
        if ($files !== null) {
            $dup->files = new FileBag($files);
        }
        if ($server !== null) {
            $dup->server = new ServerBag($server);
            $dup->headers = new HeaderBag($dup->server->getHeaders());
        }
        $dup->languages = null;
        $dup->charsets = null;
        $dup->encodings = null;
        $dup->acceptableContentTypes = null;
        $dup->pathInfo = null;
        $dup->requestUri = null;
        $dup->baseUrl = null;
        $dup->basePath = null;
        $dup->method = null;
        $dup->format = null;

        if (!$dup->get('_format') && $this->get('_format')) {
            $dup->attributes->set('_format', $this->get('_format'));
        }

        if (!$dup->getRequestFormat(null)) {
            $dup->setRequestFormat($this->getRequestFormat(null));
        }

        return $dup;
    }

 /**
  * @return \Symfony\Component\HttpFoundation\Response $response
  */
 public function saveTokenAction()
 {
     if (!$this->request->query->has('oauth_token') || !$this->request->query->has('oauth_verifier')) {
         return $this->goToSettingsAction();
     }
     $path['_controller'] = 'weaving_the_web_user.controller.twitter:getAccessTokenAction';
     $subRequest = $this->request->duplicate(['oauth_token' => $this->request->get('oauth_token'), 'oauth_verifier' => $this->request->get('oauth_verifier')], null, $path);
     /**
      * @var \Symfony\Component\HttpFoundation\Response $response
      */
     $response = $this->kernel->handle($subRequest, HttpKernelInterface::SUB_REQUEST);
     $content = $response->getContent();
     $tokenParameters = json_decode($content, true);
     if (json_last_error() !== JSON_ERROR_NONE) {
         return $this->goToSettingsAction();
     }
     $this->persistToken($tokenParameters);
     $subRequest = $this->request->duplicate(null, null, ['_controller' => 'weaving_the_web_user.controller.settings:showAction']);
     return $this->kernel->handle($subRequest, HttpKernelInterface::SUB_REQUEST);
 }