public static void UploadFileWithoutKey(string bucket, string fname)

 {
        var policy = new PutPolicy(bucket, 3600);
        string upToken = policy.Token();
        IOClient target = new IOClient();
        PutExtra extra = new PutExtra();
        PutRet ret = target.PutFileWithoutKey(upToken, "C:\\Users\\Lenovo-Chen\\Desktop\\1.jpg", extra);
        //Console.WriteLine(ret.Response.ToString());
    }