public static function URI(){
    switch(true){
      case !empty($_SERVER['REQUEST_URI']):    $serv_uri = $_SERVER['REQUEST_URI']; break;
      case !empty($_SERVER['ORIG_PATH_INFO']): $serv_uri = $_SERVER['ORIG_PATH_INFO']; break;
      case !empty($_SERVER['PATH_INFO']):      $serv_uri = $_SERVER['PATH_INFO']; break;
      default:                                 $serv_uri = '/'; break;
    }
    $uri = rtrim(strtok($serv_uri,'?'),'/') ?: '/';
    return Filter::with('core.request.URI', $uri) ?: '/';
  }