public String getUserInfo(String appKey, String userKey) {
        try {
            appKey = URLEncoder.encode(appKey, "UTF-8");
            userKey = URLEncoder.encode(userKey, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            BmLog.error(e);
        }
        return String.format("%s/api/rest/blazemeter/getUserInfo/?app_key=%s&user_key=%s", SERVER_URL, appKey, userKey);
    }