code: @Trivial
      private String getNextURL(String currentURL) {
          List<String> urlList = getEnvURLList();
          int urlIndex = getURLIndex(currentURL, urlList);
          return urlList.get((urlIndex + 1) % urlList.size());
      }
docs: Returns the next URL after the specified URL.
  
  @param currentURL Current URL
  @return Next URL