docs: public String getAssetURL(String id) {
          String url = getRepositoryUrl() + "/assets/" + id + "?";
          if (getUserId() != null) {
              url += "userId=" + getUserId();
          }
          if (getUserId() != null && getPassword() != null) {
              url += "&password=" + getPassword();
          }
          if (getApiKey() != null) {
              url += "&apiKey=" + getApiKey();
          }
          return url;
      }