upstream mongrel_servers {
    server 127.0.0.1:4500;
    server 127.0.0.1:4501;
}

server {
    listen 80;
    server_name domain.com;
    root /usr/home/app_user/app/app_name/current/public;
    index index.html index.htm;
    
    if ($request_filename ~* \.(css|jpg|gif|png)$) {
        break;
    }
    
    if (-f $document_root/system/maintenance.html) {
        rewrite (.*) system/maintenance.html last;
        break;
    }

    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;
        proxy_redirect false;

        if (-f $request_filename/index.html) {
            rewrite (.*) $1/index.html break;
        }
        
        if (-f $request_filename.html) {
            rewrite (.*) $1.html break;
        }
        
        if (!-f $request_filename) {
            proxy_pass http://mongrel_servers;
            break;
        }
    }
    
    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root html;
    }
}