protected function _download()
    {
        // Set the headers
        $this->_setHeaders(array(
            'Content-Type'        => $this->contentType,
            'Content-Disposition' => 'attachment; filename="' . $this->title . '.' . $this->ext . '"',
            'Expires'             => 'Mon, 26 Jul 1997 05:00:00 GMT', // Date in the past
            'Last-Modified'       => Carbon::now()->format('D, d M Y H:i:s'),
            'Cache-Control'       => 'cache, must-revalidate',
            'Pragma'              => 'no-cache'
        ));

        // Check if writer isset
        if(!$this->writer)
            throw new LaravelExcelException('[ERROR] No writer was set.');

        // Download
        $this->writer->save('php://output');
    }