static function find($file, $prefix_cdn_config = "cdn")
	{
		if (!$real_path = \Fw\Find::in("assets", $file)) throw new \Exception("$file not found");
		$so = strlen(\Fw\Config::get("docroot")) - 1;
		return \Fw\Config::get($prefix_cdn_config) . substr($real_path, $so);
	}