nginx block request for ip number

Question

I'm using nginx. If my ip numbers are 1.2.3.4 and 1.2.3.5, how can I configure it to block requests for the ip numbers and only allow domains. If site1.com is configured for 1.2.3.4, I want to allow a request for site1.com but deny a request for 1.2.3.4.

Answer 1

You can create a default catch-all virtual host to serve requests for non-configured domains and do whatever you want with these requests. Something like this:

# Default vhost
server {
    listen 1.2.3.4:80 default_server;
    server_name _;

    location / {
        return 404;
    }
}

# site1.com
server {
    listen 1.2.3.4:80;
    server_name site1.com;
    ...
}