👀 I wrote about this here: What Does Asterisk *, Plus +, and Double Colon :: Mean in ASP.NET Core URLs?
A repo designed just to simply test out different bindings.
To play around with this head over to appsettings.json and change the URLs. For example, you could change them to any of the following:
http://*:5400
http://+:5401
http://€:5400
http://*-+!@#$%^&*():5401
http://0.0.0.0:5400
http://[::]:5400