module Rack

Rack::Attack::Request is the same as ::Rack::Request by default.

This is a safe place to add custom helper methods to the request object through monkey patching:

class Rack::Attack::Request < ::Rack::Request
  def localhost?
    ip == "127.0.0.1"
  end
end

Rack::Attack.whitelist("localhost") {|req| req.localhost? }