proxy reverso usando nginx

gistfile1.txt

    upstream server {
        server 67.159.35.2;
    }
    server {
        listen       80;
        server_name  avelino.us www.avelino.us;
        location / {

            proxy_cache proxy-cache;
            proxy_cache_key "$host$request_uri$args";
            proxy_ignore_headers "Cache-Control" "Expires";
            proxy_cache_min_uses 1;
            proxy_hide_header Set-Cookie;
            proxy_cache_valid 200 301 302 30m;
            proxy_cache_valid any 0m;
            proxy_buffering on;

            proxy_pass http://server;
            proxy_redirect off;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
        }

    }