private function get_header_url(){
    return "wget -O - --quiet --http-user=" . $this->user . " --http-passwd=" . escapeshellarg($this->pass) . " --no-check-certificate 'https://" . $this->hostname . ":10000/".(
      $this->mode === 'cloudmin' ? 'server-manager' : 'virtual-server'
    )."/remote.cgi?json=1&multiline=&program=";
  }