how to disable direct access to a web site by ip address

Question

I have a website on a VPS.

The issue I am having is that when I enter the IP of the server, it links to the website.
Even when entering mail.domain.com, it does the

Answer 1

You can just add a server directive before others.

server {
    listen 80;
    server_name _;
    return 404;
}