_filtered_referrer

# File actionview/lib/action_view/helpers/url_helper.rb, line 55
      def _filtered_referrer # :nodoc:
        if controller.respond_to?(:request)
          referrer = controller.request.env["HTTP_REFERER"]
          if referrer && URI(referrer).scheme != "javascript"
            referrer
          end
        end
      rescue URI::InvalidURIError
      end