Symfony\Component\HttpKernel\Kernel::handle PHP Method

    public function handle(Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true)
    {
        if (false === $this->booted) {
            $this->boot();
        }

        return $this->container->get('http_kernel')->handle($request, $type, $catch);
    }

 /**
  * @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);
 }