laravel subrequest how to get subrequest url

so I have this simple code to make another request and return the content:

   //from https://github.com/SamuelDavis/laravel-helpers-subrequest
    function subRequest($url){
            $url = url($url);
            $request = Request::create($url, 'get');
            $dispatched = Route::dispatch($request);
            return $dispatched->getContent();
    }

and this two simple routes:

Route::get('/first', function () {
        return subRequest('/second/1');
    });

Route::get('/second/{id}', function () {
       echo Route::current()->getUri();
       echo Request::fullUrl();
       return '';
    });

what I want is when user will request "/first" he will get the second route url which is:

"/second/1"

right now I cant find a way to make it happen as the first echo is returining

/second/{id}

and the second echo :

http://1.1.1.1/first //(which is the first request url)

via Amir Bar