Uncacheable web pages in Rails

In an attempt to ensure that a page is always fetched from
the server I needed to add the following code to my base
controller. Seems to be a bit long-winded but does the job.

class ApplicationController < ActionController::Base
  before_filter :force_no_cache

  def force_no_cache
    # set modify date to current timestamp
    response.headers["Last-Modified"] = CGI::rfc1123_date(Time.now)
    # set expiry to back in the past 
    # (makes us a bad candidate for caching)
    response.headers["Expires"] = 0

    # HTTP 1.0 (disable caching)
    response.headers["Pragma"] = "no-cache"

    # HTTP 1.1 (disable caching of any kind)
    # HTTP 1.1 'pre-check=0, post-check=0' (IE specific)
    response.headers["Cache-Control"] = 
      "no-cache, no-store, must-revalidate, pre-check=0, post-check=0"