Stupid thing I did for my own amusement:
Created
https://lwgrs.cloud/countdown.html
Copied that file to
https://lwgrs.cloud/countdown/index.html
The countdown.html link now redirects to
https://lwgrs.cloud/countdown/
https://lwgrs.cloud/countdown.html
https://lwgrs.cloud/countdown/index.html
https://lwgrs.cloud/countdown/