Why in Spring start page "/" doesn't display everything as in index.html?

Question

Spring

Guys, I started to study Spring relatively recently and in my educational project for some reason when the start page is loaded "/" does not display everything from index.html , but if I add /index to the line and the index page opens for me, then everything is correct there . Can someone explain to me why this is happening? I thought that when I load the start page "/" it is my index.html.

Answer 1

Probably because the controller is written for /index and not for /
I have a prediction ball for maintenance today, I can't say for sure without code...