nginx.conf.erb

server {
  listen      8000;
  server_name <%= @server_name %>;
  root        <%= @root %>;

  # Allow all assets to be cached by CloudFront and browsers.
  add_header Cache-Control public;

  # Default expires of 1 hour.
  expires 1h;

  # Only set far-future expires for assets with hashes. Note: since max_expire
  # contains curly brackets in the regexp, we must use quotes.
  location ~* "<%= @max_expire %>" {
    expires    max;
  }
}