在node安装了Socket.IO，做demo时报错
WebSocket connection to 'ws://localhost:8999/socket.io/?EIO=3&transport=websocket&sid=D0fxLuPwjHWgYSI7AAAB' failed: Error during WebSocket handshake: Unexpected response code: 400 WebSocket
阅读背景：
Socket.IO failed: Error during WebSocket handshake:
来源：互联网
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