private function setAttribute($name, $value = null)
{
    if (isset($this->reply[$name])) {
        if (empty($value)) {
            unset($this->reply[$name])
            return $this;
        }

        if (is_array($this->reply[$name]) && is_array($value)) {
            $this->reply[$name] += $value;
            return $this;
        }
    }

    $this->reply[$name] = $value;
    return $this;
}