httpable.rb

# an module to redirect a controller to http from https
# drop this in lib/httpable.rb
module Httpable
  
  def self.included(base)
    base.send :include, InstanceMethods
    base.before_filter :redirect_to_http
  end
  
  module InstanceMethods
    
  private
  
    def redirect_to_http
      redirect_to :protocol => "http" if request.ssl?
    end

  end
  
end

# include this module into controllers which should redirect to http
class PagesController < ApplicationController
  include Httpable
end