}
            throw e;
        }
    }

    protected LoginCredential processCallback(final HttpServletRequest request, final String code) {
        try {
            final TokenResponse tr = getTokenUrl(code);

            final String[] jwt = ((String) tr.get("id_token")).split("\\.");
            final String jwtHeader = new String(decodeBase64(jwt[0]), Constants.UTF_8_CHARSET);