# File lib/action_controller/request.rb, line 851
    def original_filename
      unless defined? @original_filename
        @original_filename =
          unless original_path.blank?
            if original_path =~ /^(?:.*[:\\\/])?(.*)/m
              $1
            else
              File.basename original_path
            end
          end
      end
      @original_filename
    end