LiveQuery没有响应

Question

我正在Heroku上运行我的parse-server，当我在iOS应用程序上订阅一个事件时，我得不到任何响应。该应用程序能够正确保存和查询服务器，但是当我创建一个新行时，我对Event.Created的订阅不会触发。

下面是我的index.js和我正在使用的Swift代码（删除了密钥和网址）

Index.js:

var api = new ParseServer({
  databaseURI: databaseUri || 'mongodb://localhost:27017/dev',
  cloud: process.env.CLOUD_CODE_MAIN || __dirname + '/cloud/main.js',
  appId: process.env.APP_ID || '',
  masterKey: process.env.MASTER_KEY || '', //Add your master key here. Keep it secret!
  serverURL: process.env.SERVER_URL || 'https://myserver.com/parse',  // Don't forget to change to https if needed
  oauth: {
   twitter: {
     consumer_key: "", // REQUIRED
     consumer_secret: "" // REQUIRED
   },
   facebook: {
     appIds: ""
   }
  },
  liveQuery: {
    classNames: ['Message']
  }
});

...

var port = process.env.PORT || 1337;
// Initialize a LiveQuery server instance, app is the express app of your Parse Server
var httpServer = require('http').createServer(app);
httpServer.listen(port);
var parseLiveQueryServer = ParseServer.createLiveQueryServer(httpServer);

Swift Code：

let query = PFQuery(className: "Message").whereKey("gameId", equalTo: event!.objectId!)
        let subscription = query.subscribe()
        subscription.handle(Event.Created) { (query, object) in
            print("it worked!")
        }