Illuminate\Routing\Router::prepareResponse PHP Method

    public function prepareResponse($request, $response)
    {
        if ($response instanceof PsrResponseInterface) {
            $response = (new HttpFoundationFactory())->createResponse($response);
        } elseif (!$response instanceof SymfonyResponse) {
            $response = new Response($response);
        }
        return $response->prepare($request);
    }

 /**
  * Call the given controller instance method.
  *
  * @param  \Illuminate\Routing\Controller  $instance
  * @param  \Illuminate\Routing\Route  $route
  * @param  \Illuminate\Http\Request  $request
  * @param  string  $method
  * @return mixed
  */
 protected function callWithinStack($instance, $route, $request, $method)
 {
     $middleware = $this->getMiddleware($instance, $method);
     $shouldSkipMiddleware = $this->container->bound('middleware.disable') && $this->container->make('middleware.disable') === true;
     return (new Pipeline($this->container))->send($request)->through($shouldSkipMiddleware ? [] : $middleware)->then(function ($request) use($instance, $route, $method) {
         return $this->router->prepareResponse($request, $this->call($instance, $route, $method));
     });
 }