protected function generateFragmentUri(ControllerReference $reference, Request $request, $absolute = false, $strict = true)
    {
        if ($strict) {
            $this->checkNonScalar($reference->attributes);
        }

        // We need to forward the current _format and _locale values as we don't have
        // a proper routing pattern to do the job for us.
        // This makes things inconsistent if you switch from rendering a controller
        // to rendering a route if the route pattern does not contain the special
        // _format and _locale placeholders.
        if (!isset($reference->attributes['_format'])) {
            $reference->attributes['_format'] = $request->getRequestFormat();
        }
        if (!isset($reference->attributes['_locale'])) {
            $reference->attributes['_locale'] = $request->getLocale();
        }

        $reference->attributes['_controller'] = $reference->controller;

        $reference->query['_path'] = http_build_query($reference->attributes, '', '&');

        $path = $this->fragmentPath.'?'.http_build_query($reference->query, '', '&');

        if ($absolute) {
            return $request->getUriForPath($path);
        }

        return $request->getBaseUrl().$path;
    }