code: public void run() {
  
      ResponseWrapper response = null;
  
      LOGGER.info("Received probe id: " + probe.getProbeId());
  
      // Only handle probes that we haven't handled before
      // The Probe Generator needs to send a stream of identical UDP packets
      // to compensate for UDP reliability issues. Therefore, the Responder
      // will likely get more than 1 identical probe. We should ignore
      // duplicates.
      if (!isProbeHandled(probe.getProbeId())) {
  
        if (this.noBrowser && probe.isNaked()) {
          LOGGER.warn("Responder set to noBrowser mode. Discarding naked probe with id [" + probe.getProbeId() + "]");
        } else {
  
          for (ProbeHandlerPlugin handler : handlers) {
            response = handler.handleProbeEvent(probe);
            if (!response.isEmpty()) {
              LOGGER.debug("Response to probe [" + probe.getProbeId() + "] includes " + response.numberOfServices());
              Iterator<RespondToURL> respondToURLs = probe.getRespondToURLs().iterator();
  
              if (probe.getRespondToURLs().isEmpty())
                LOGGER.warn("Processed probe [" + probe.getProbeId() + "] with no respondTo address. That's odd.");
  
              if (respondToURLs.hasNext()) {
                RespondToURL respondToURL = respondToURLs.next();
                // we are ignoring the label for now
                boolean success = sendResponse(respondToURL.url, probe.getRespondToPayloadType(), response);
                if (!success) {
                  LOGGER.warn("Issue sending probe [" + probe.getProbeId() + "] response to [" + respondToURL.url + "]");
                }
              }
  
            } else {
              LOGGER.error("Response to probe [" + probe.getProbeId() + "] is empty.  Not sending empty response.");
            }
          }
  
        }
  
        markProbeAsHandled(probe.getProbeId());
  
        responder.probeProcessed();
  
      } else {
        LOGGER.info("Discarding duplicate/handled probe with id: " + probe.getProbeId());
      }
    }
docs: Handle the probe.