server {
  listen       80;
  server_name  static.domain.com;

  location ~* .(gif|jpg|jpeg|png|webp|wmv|avi|mpg|mpeg|mp4|htm|html|js|css|mp3|swf|ico|flv)$ {
    expires max;
    add_header X-CDN-Location BLR;
    proxy_set_header  X-Real-IP  $remote_addr;
    proxy_pass http://domain.com;
    proxy_ignore_headers X-Accel-Expires Expires Cache-Control;
    proxy_store /var/www/cache$uri;
    proxy_store_access user:rw group:rw all:r;
  }