Rails 3.2 ceate static pages with page_cache and rake

cache.rake

desc 'Generate the static pages'
task :cache => :environment do
  pages = %w(404 422 500)
  app = Rails.application
  app.config.action_controller.perform_caching = true
  session = ActionDispatch::Integration::Session.new(app)
  pages.each { |page| puts session.get("/#{page}") }
end

errors_controller.rb

class ErrorsController < ApplicationController
  caches_page :show
  
  def show
    # create 404.html.erb, etc in errors/views
    render params[:id]
  end
end

routes.rb

match '/:id' => 'errors#show'