code: private void handleQueries(
        final HttpServletResponse response,
        final Map<String, List<String>> queries,
        final String version) throws IOException {
  
      LOG.log(Level.INFO, "HttpServerReefEventHandler handleQueries is called");
  
      for (final Map.Entry<String, List<String>> entry : queries.entrySet()) {
        final String queryTarget = entry.getKey().toLowerCase();
  
        switch (queryTarget) {
        case "id":
          if (version.equals(VER)) {
            writeEvaluatorInfoJsonOutput(response, entry.getValue());
          } else {
            writeEvaluatorInfoWebOutput(response, entry.getValue());
          }
          break;
        default:
          response.getWriter().println("Unsupported query : " + queryTarget);
          break;
        }
      }
    }
docs: handle HTTP queries.
  Example of a query: http://localhost:8080/reef/Evaluators/?id=Node-2-1403225213803&id=Node-1-1403225213712