reverse-proxy.conf

real_ip_header    X-Forwarded-For;
set_real_ip_from  0.0.0.0/0;

split_clients "$remote_addr" $variant {
  50% "google.com";
  *   "yahoo.com";
}

server {
  listen 80;
  proxy_set_header X-Real-IP        $remote_addr;
  proxy_set_header X-Forwarded-For  $proxy_add_x_forwarded_for;
  
  location / {
    resolver    8.8.8.8;
    proxy_pass  https://$variant;
  }
}