server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # Prevent search engines from indexing MTA-STS policy (technical file, not for search)
    location /.well-known/ {
        root /usr/share/nginx/html;
        add_header X-Robots-Tag "noindex, nofollow";
        try_files $uri =404;
    }

    location / {
        try_files $uri $uri/ =404;
    }
}