A tool called ngrok is used to easily implement skills on your computer. Get ngrok with the following command.
$ npm i -g ngrok
Once you have it, launch a new terminal and run the following command.
Since it is 8080 port for Tomcat, execute as follows.
ngrok http 8080
If all went well, you should see some URLs. Use the URL beginning with https called Forwarding. Since the program to be executed is placed in /xxxxx this time, copy https://${Fording URL}/xxxxx and enter it in the URL of WebHook.