public function urlServeZipped($sObjectIds, $sHash, $sFilename)
    {
        $sUrl = $this->urlServeZippedScheme();

        //  Sub in the values
        $sUrl = str_replace('{{ids}}', $sObjectIds, $sUrl);
        $sUrl = str_replace('{{hash}}', $sHash, $sUrl);
        $sUrl = str_replace('{{filename}}', urlencode($sFilename), $sUrl);

        return $sUrl;
    }