gistfile1.rb

class ApplicationController < ActionController::Base
  protected
    def rescue_optional_error_file(status_code)
      known_codes = ["404", "422", "500"]
      status = interpret_status(status_code)
 
      if known_codes.include?(status_code)
        render :template => "/errors/#{status[0,3]}.html.erb", :status => status, :layout => 'application.html.erb'
      else
        render :template => "/errors/unknown.html.erb", :status => status, :layout => 'application.html.erb'
      end
    end
end