public async Task GetQRCode()
        {
            Response.ContentType = "image/jpeg";

            string qrToken = await SecurityServices.GetQRToken();

            var bitmap = QRCodeHelper.GetQRCode($"{domain}/Security/Login?token={qrToken}", 4);

            // 将二维码回调标识输出给cookie
            // 创建cookie
            Response.Cookies.Append(QRTOKEN_COOKIE_NAME, qrToken);

            bitmap.Save(Response.Body, ImageFormat.Jpeg);
        }