gistfile1.txt

server {                                                                             
  listen   80 default;                                                             
  listen 443 default ssl;                                                          
  server_name  www.example.com;                                          
                                                                                
  if ($server_port = 443) {                                                        
    proxy_set_header X_FORWARDED_PROTO https;                                                                                 
  }
}