normalize_action_path

# File actionpack/lib/action_controller/metal/request_forgery_protection.rb, line 645
      def normalize_action_path(action_path)
        uri = URI.parse(action_path)

        if uri.relative? && (action_path.blank? || !action_path.start_with?("/"))
          normalize_relative_action_path(uri.path)
        else
          uri.path.chomp("/")
        end
      end