Admin::ShipmentsController.class_eval do
  def dhllabel
    load_shipment
    name = '%s_dhllabel.csv' % [@order.number]
    headers["Content-type"] = "text/plain"
    headers["Cache-Control"] = "no-cache, max-age=0, must-revalidate"
    headers["Pragma"] = "no-cache"
    headers["Expires"] = "Fri, 01 Jan 1990 00:00:00 GMT"
    headers["Content-Disposition"] = "attachment; filename=\"%s\"" % name
  end
end