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