从客户端进行Mobile First Server 8.0连接检查

Question

需要检查MFP服务器是否启动并运行，如果服务器无法访问，则需要提醒用户系统已关闭。

我使用了以下代码

renderer.listen('document', 'mfpjsloaded', () => {
  WLAuthorizationManager.obtainAccessToken("").then(
  function(accessToken) {
    console.log("MFP Server is up and running");       
 },
 function(error) {
   console.log("MFP Server is not reachable");
 }
);

}）;

但是app会抛出 Application Error The connection to the server was unsuccessful. (file:///android_asset/www/index.html)