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websocket error
io.socket.engineio.client.EngineIOException: xhr poll error at io.socket.engineio.client.Transport.onError( at io.socket.engineio.client.transports.PollingXHR.access$100( at io.socket.engineio.client.transports.PollingXHR$6$ at io.socket.thread.EventThread$ at java.util.concurrent.ThreadPoolExecutor.runWorker( at java.util.concurrent.ThreadPoolExecutor$ at by: at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance( at sun.reflect.DelegatingConstructorAccessorImpl.newInstance( at java.lang.reflect.Constructor.newInstance( at$ at$ at Method) at at at at at at io.socket.engineio.client.transports.PollingXHR$Request$ ... 1 more