Is there a way to edit/remove url filenames(especially .html extensions) from website url without access to the server?

I have a website which is hosted on my university's servers.

The url shows up like

website.com/index.html

I would highly prefer it to show like:

website.com

Or at least like:

website.com/index

Is there a way of manipulating how the url shows up without changing server properties?

This also applies to urls like "website.com/about.html" , i would prefer them to be like "website.com/about".