/**
  * Handle an incoming request.
  *
  * @param  \Illuminate\Http\Request  $request
  * @param  \Closure  $next
  * @return mixed
  */
 public function handle($request, Closure $next)
 {
     if (User::where('id', '=', $request->segment(3))->get()->isEmpty()) {
         return response()->json(['error' => 'User not found!'], 404);
     }
     return $next($request);
 }