未定義ホストへのリクエストを切断するNginx設定

illegal.conf

server {
    listen 80 default_server;
    listen [::]:80 default_server;
    listen 443 default_server;
    listen [::]:443 default_server;

    server_name _;

    # Reject SSL handshake on port 443
    ssl_reject_handshake on;

    # Disconnect on port 80
    return 444;
}