public function download($sFilename = '', $aOptions = [])
    {
        $sFilename = $sFilename ? $sFilename : self::DEFAULT_FILE_NAME;

        //  Set the content attachment, by default send to the browser
        $aOptions['Attachment'] = 1;

        $this->oDomPdf->render();
        $this->oDomPdf->stream($sFilename, $aOptions);
        exit();
    }