anchor.diff:  
         proxy_pass $upstream_endpoint;
       }
  -
  -    error_page 500 502 503 504 /500.html;
  -    location = /500.html {
  -      root /srv/www/hats/current/public/;
  -    }
     }
   }
  
positive.code: 
      keepalive_timeout 5;
  
      if ($request_uri ~ /health_check) {
        set $action "${action}_health_check";
      }
  
      location / {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
  
negative.code: user nginx;
  worker_processes auto;
  
  error_log  /var/log/nginx/error.log;
  pid        /var/run/nginx.pid;
  
  events {
    worker_connections  2048;
  }
  
  http {
  