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我剛剛學會和實施我的第一個流星應用程序簡單meteor create hellometeor命令，然後用ngrok使localhost:3000端口生活。OpeningHandshakeException對於Android應用程序流星後端
然後我用delight-im/Android-DDP庫連接到直接ws網址按下面的代碼：
// create a new instance, where mMeteor is a global var.
mMeteor = new Meteor(this, "ws://180a3c0e.ngrok.io", new InMemoryDatabase()); // "ws://180a3c0e.ngrok.io" is the temp. url after tunneling `localhost:3000`
// register the callback that will handle events and receive messages
mMeteor.addCallback(this); // as the activity implements MeteorCallback
// establish the connection
mMeteor.connect();
但每一次我嘗試運行這段代碼，我發現了以下錯誤，對於其中我發現谷歌搜索和閱讀的過去6個小時中沒有暗示或直接的解決方案，對於像平臺流星像我這樣的新手：
W/System.err: java.lang.Exception: com.neovisionaries.ws.client.OpeningHandshakeException: The status code of the opening handshake response is not '101 Switching Protocols'. The status line is: HTTP/1.0 502 Bad Gateway
W/System.err: at im.delight.android.ddp.Meteor$1.onError(Meteor.java:195)
W/System.err: at com.neovisionaries.ws.client.ListenerManager.callOnError(ListenerManager.java:432)
W/System.err: at com.neovisionaries.ws.client.ConnectThread.handleError(ConnectThread.java:50)
W/System.err: at com.neovisionaries.ws.client.ConnectThread.run(ConnectThread.java:41)
W/System.err: Caused by: com.neovisionaries.ws.client.OpeningHandshakeException: The status code of the opening handshake response is not '101 Switching Protocols'. The status line is: HTTP/1.0 502 Bad Gateway
W/System.err: at com.neovisionaries.ws.client.HandshakeReader.validateStatusLine(HandshakeReader.java:232)
W/System.err: at com.neovisionaries.ws.client.HandshakeReader.readHandshake(HandshakeReader.java:54)
W/System.err: at com.neovisionaries.ws.client.WebSocket.readHandshake(WebSocket.java:3113)
W/System.err: at com.neovisionaries.ws.client.WebSocket.shakeHands(WebSocket.java:2992)
W/System.err: at com.neovisionaries.ws.client.WebSocket.connect(WebSocket.java:2034)
W/System.err: at com.neovisionaries.ws.client.ConnectThread.run(ConnectThread.java:37)
可能是我缺少一個很平常的事在流星服務器端，因爲我沒有在其中編寫一行代碼，而不是啓動項目。
請在這方面給我啓發。 TIA。
TIA。