protected String getGTFront()
        {
            String     private_key = "0f1a37e33c9ed10dd2e133fe2ae9c459";
            String     captcha_id  = "a40fd3b0d712165c5d13e6f747e948d4";
            GeetestLib geetest     = new GeetestLib(private_key, captcha_id);

            if (geetest.register())
            {
                return(geetest.getGTApiUrl());
            }
            else
            {
                //TODO
                return("");
            }
        }