public function createFolder($strFolder, $storageName = '')
    {
        //build URI
        $strURIRequest = $this->strURIFolder . $strFolder;
        if ($storageName != '') {
            $strURIRequest .= '?storage=' . $storageName;
        }
        //sign URI
        $signedURI = Utils::sign($strURIRequest);

        $responseStream = json_decode(Utils::processCommand($signedURI, 'PUT', '', ''));

        if ($responseStream->Code != 200) {
            return FALSE;
        }
        return TRUE;
    }