Are secret URLs truly secure?

Question

I never leave backdoors in my system, but out of curiosity I was wondering if I left a secret URL like /x52d23r that allowed to bypass some sort of security, and this was on

Answer 1

It's not secure.

For HTTP traffic your secret URL would effectively be public as soon as you use it. Without any password protection an eavesdropper listening to your network traffic could see the URL you send and then visit the same page.