code: private void writeEvaluatorInfoJsonOutput(
        final HttpServletResponse response, final List<String> ids) throws IOException {
      try {
        final EvaluatorInfoSerializer serializer =
            Tang.Factory.getTang().newInjector().getInstance(EvaluatorInfoSerializer.class);
        final AvroEvaluatorsInfo evaluatorsInfo =
            serializer.toAvro(ids, this.reefStateManager.getEvaluators());
        writeResponse(response, serializer.toString(evaluatorsInfo));
      } catch (final InjectionException e) {
        LOG.log(Level.SEVERE, "Error in injecting EvaluatorInfoSerializer.", e);
        writeResponse(response, "Error in injecting EvaluatorInfoSerializer: " + e);
      }
    }
docs: Write Evaluator info as JSON format to HTTP Response.