server {
    # Block requests with invalid HTTP_HOST header, eg. bots querying us by IP.
    # This in particular fixes Django's error emails "Invalid HTTP_HOST header".
    listen 80 default_server;
    listen 443 ssl;
    ssl_certificate /etc/nginx/certs/default/fullchain.pem;
    ssl_certificate_key /etc/nginx/certs/default/privkey.pem;
    return 444;
}
