Accept only subdomain in nginx

Question

I have a reverse proxy set up in nginx for a node.js server.

server {
    listen 80;

    server_name sub.domain.tld;

    location / {
        proxy_pass http://localhost:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

It works all fine and dandy, however, I only want sub.domain.tld to work. Opening up domain.tld in a browser still routes to the node.js server.

Answer 1

try to add this

server {
    listen 80;
    server_name domain.tld;
    return 404;
}