    # File lib/rack/request.rb, line 240
        def update_param(k, v)
          found = false
          if self.GET.has_key?(k)
            found = true
            self.GET[k] = v
          end
          if self.POST.has_key?(k)
            found = true
            self.POST[k] = v
          end
          unless found
            self.GET[k] = v
          end
          @params = nil
          nil
        end