How to solve 'Please wait...' after deploying in docker

when I access the website by domain name. The output in chrome console.

WebSocket connection to 'ws://xxxxxxxx.com/stream' failed: WebSocket is closed before the connection is established.
WebSocket connection to 'ws://xxxxxxx.com/stream' failed: 
WebsocketConnection WebSocket onerror

It’s not happended via ip:port.

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i have the same problem, help please.