merb-no_cache.rb

# before :no_cache, :only => [:list, :of, :actions]
class Application
  def no_cache
    headers["Last-Modified"] = Time.now.httpdate
    headers["Pragma"] = "no-cache"
    headers["Cache-Control"] = "no-store, no-cache, must-revalidate, max-age=0, pre-check=0, post-check=0"
  end
end