DYNAMIC ERROR PAGES IN RAILS

# config/routes.rb
%w( 404 422 500 ).each do |code|
  get code, :to => "errors#show", :code => code
end

# app/views/errors/404.html.haml
%h1 404 - Not Found

class ErrorsController < ApplicationController
 
  def show
    render status_code.to_s, :status => status_code
  end
 
protected
 
  def status_code
    params[:code] || 500
  end
 
end