private function init()
 {
     if ($this->ready) {
         return;
     }
     $this->ready = true;
     $settings = array('baseUri' => $this->createBaseUri(), 'userName' => $this->user, 'password' => $this->password);
     $this->client = new \Sabre\DAV\Client($settings);
     $this->client->setVerifyPeer(false);
 }