How to redirect to another page without refreshing the page?

Question

JavaScript

Let's say I'm sure that the person is on the page /test1
How to make it so that after pressing the button in the admin panel the person is redirected to the page, say, /test2
(that is, the client immediately redirects without refreshing the page).
Direct at least in which direction to dig.

Answer 1

sockets + javascript

Answer 2

Spa history api and so on on the client, however, you can manually load partial renders, but as for me, this is now a perversion