How to make the server not respond to non-existent sites?

Question

Nginx

There are vps, five sites are spinning safely, they also
set the task to throw out one site via https, ok - done, the config removed nginx rebooted - I go to the site that I just deleted - and one of the 4 remaining ones is shown on you.
How to make nginx forget at all that there was a certain site and if it is not there, then do not open anything?
Thank you!

Answer 1

Make a stub, it will give 403, well, or you can show your page (the whole point is in default_server):

server {
  listen %ip%:80 default_server;
  return 403;
}

server {
  listen %ip%:443 ssl http2 default_server;
  ssl_certificate /etc/nginx/ssl/nginx.crt;
  ssl_certificate_key /etc/nginx/ssl/nginx.key;
  return 403;
}