Standalone Web App URL Parameters

How can I provide a parameter in the URL of a standalone web app and then retrieve those parameters when the app launches?

For example, the URL of my web app looks something like this:

http://123.123.123.123:8080

For example, I tried this but it does not present the app.

http://123.123.123.123:8080?data=123

http://123.123.123.123:8080/?data=123

https://documentation.xojo.com/api/web/websession.html#websession-urlParameter

Perfect answers, thanks