public static function download($object, $format = 'pdf',
                                    $attachmentID = null)
    {
        $attachments = self::getAttachmentsList($object);

        if (isset($attachmentID) && !array_key_exists($attachmentID,
                $attachments)) {
            $object->addStatusMessage(sprintf(_('Attagment %s does no exist'),
                    $attachmentID), 'warning');
        }

        $attachmentBody = $object->doCurlRequest(self::getDownloadUrl($object),
            'GET');
        header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Transfer-Encoding: binary');
        header('Expires: 0');
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Pragma: public');
        header('Content-Disposition: attachment; filename='.$object->getEvidence().'_'.$object.'.'.$format);
        header('Content-Length: '.strlen($attachmentBody));
        echo $attachmentBody;
    }