public function clear()
  {
    $this->setCookies( array() );
    $this->setStatusCode(200);
    $this->setHeaders( array() );
    $this->setHeader('Content-Type', 'application/json; charset=utf8');
    $this->setCacheControl('no-cache');
    $this->setCharSet('utf8');
    $this->setBody('');
    $this->setFileBody('');

    return $this;
  }