nginx request blocking based on server_name

Question

I am still newbie to nginx.

I am trying to block every request that came from somewhere but not server_name.

According to documentation it should work but I didn't succede.

I assume there are should be another method, say, block in if condition by checking $hostname.

What do you suggest to do in order to block request?

Thanks

Answer 1

Make a default server section to catch requests for invalid virtual hosts.

server {
    listen 80 default_server;
    server_name invalid.mydomain.com;
    return 404;
}
server { 
    listen 80;
    server_name valid.mydomain.com;
    ...
}