anchor.diff:        proxy_set_header  X-Real-IP        $remote_addr;
         proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
         proxy_set_header  Host             $http_host;
  +      proxy_set_header  X_FORWARDED_PROTO $scheme;
         proxy_redirect    off;
         proxy_pass        http://mongrel;
       }
  
positive.code: 
  
  events {
      worker_connections  10;
  }
  
  http {
  
negative.code:       proxy_set_header  X-Real-IP        $remote_addr;
        proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
        proxy_set_header  Host             $http_host;
        proxy_set_header  X_FORWARDED_PROTO $scheme;
        proxy_redirect    off;
        proxy_pass        http://mongrel;
      }
  