How to check user authorization in the system?

Question

PHP

Good day.
I have a web application that requires user authorization. The web application itself is a set of html pages that use AngularJS and all interaction with the server takes place through it. But how to make the system redirect an unauthorized user to the authorization form if he goes to any page of the application using a direct link? (For example www.vasyapupkin.by/main.html)

Answer 1

Maybe I don’t fully understand it, but in theory you can check on each page whether the user has cookies or session data indicating that he was type authorized. If not, redirect via header (location ...)
But this is not accurate!

Answer 2

The server responds with a 401 (UNAUTHORIZED) response code, after which a redirect to /login