xip

server {
  listen 80;

  # my.example.com.127.0.0.1.xip.io;
  server_name "~^.*?([^.]+\.[^.]+)\.((?:\d{1,3}\.){3}\d{1,3})\.xip\.io$";

  location / {
    proxy_set_header host $host;
    proxy_set_header x-real-ip $remote_addr;
    proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
    proxy_pass http://$1;
  }
}