nginx_rewrite.conf

upstream ghs {
    server ghs.google.com:80;
}

server {
    listen 80;
    server_name www.example.com;

    location / {
        proxy_redirect off;
        proxy_set_header Host $host;
        proxy_pass http://ghs;
        proxy_set_header x-real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}