function list_objects($limit=0, $marker=NULL, $prefix=NULL, $path=NULL)
    {
        list($status, $reason, $obj_list) =
            $this->cfs_http->list_objects($this->name, $limit,
                $marker, $prefix, $path);
        #if ($status == 401 && $this->_re_auth()) {
        #    return $this->list_objects($limit, $marker, $prefix, $path);
        #}
        if ($status < 200 || $status > 299) {
            throw new InvalidResponseException(
                "Invalid response (".$status."): ".$this->cfs_http->get_error());
        }
        return $obj_list;
    }