server {
  listen       80;
  server_name  localhost;

  location / {
    js_challenge on;
    js_challenge_secret "change me!";
    js_challenge_html /etc/nginx/loading.html;
    js_challenge_bucket_duration 3600;
    js_challenge_title "Verifying your browser...";
    root   /usr/share/nginx/html;
    index  index.html index.htm;
  }
}