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