nginx config for wordpress proxying

wordpress-blog.conf

upstream wordpress {
        server 127.0.0.1:80 weight=1 fail_timeout=120s;
}

server {
  listen       81;
  server_name  blog.foo.bar;
  proxy_cache_valid 200 20m;
  access_log  /var/log/httpd/nginx-access.log combined;

  # for debuging, log cache hit or miss. comment out once in prod.
  log_format  up_head  '[$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_x_forwarded_for" "$upstream_cache_status"';
  access_log /var/log/nginx/blog.foo.bar-access.log up_head;

  proxy_set_header X-Real-IP  $remote_addr;
  proxy_set_header Host $host;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

  #unless specified, activate the caching
  set $do_not_cache 0;

  location / {
    # If logged in, don't cache.
    if ($http_cookie ~* "comment_author_ | 
        wordpress_(?!test_cookie) | 
        wp-postpass_" ) {
      set $do_not_cache 1;
    }
    proxy_cache_key "$scheme://$host$request_uri $do_not_cache";
    proxy_cache staticfilecache;
    proxy_pass http://wordpress;
  }

  location ~* wp\-.*\.php|wp\-admin {
    proxy_pass http://wordpress;
  }

  location ~* \.(jpg|png|gif|jpeg|css|js|mp3|swf|pdf)$ {
    proxy_cache_valid 200 120m;
    expires 864000;
    proxy_pass http://wordpress;
    proxy_cache staticfilecache;
  }

  location ~* \/[^\/]+\/(feed|\.xml)\/? {
    # Cache RSS looking feeds for 45 minutes unless logged in.
    if ($http_cookie ~* "comment_author_|
        wordpress_(?!test_cookie)|
        wp-postpass_" ) {
      set $do_not_cache 1;
    }
    proxy_cache_key "$scheme://$host$request_uri $do_not_cache";
    proxy_cache_valid 200 45m;
    proxy_cache staticfilecache;
    proxy_pass http://wordpress;
  }

  location ~ /\.ht {
    deny  all;
  }
}