/vendor/workerman/webman-framework/src/App.php
   /**
     * @param $connection
     * @param $path
     * @param $key
     * @param $request
     * @return bool
     */
    protected static function findFile($connection, $path, $key, $request)
    {
        $path =urldecode($path); //這么添加是否有風(fēng)險等問題

        $public_dir = static::$_publicPath;
        $file = "$public_dir/$path";

        if (!\is_file($file)) {
            return false;
        }