java 使用netty socketio 控制台报错「sessionId」 is not registered. Closing connection.

症状:

前端使用socket.in-client ，持续请求 持续请求/socket.io/?EIO=3&transport=polling&t=N8HrzIR

后端报错 「sessionId」 is not registered. Closing connection

需要将transport=polling 改成 transport={websocket}

如下：

const socket = io("ws://example.com",{
        query: { clientid: userTmp.userID },transports: ["websocket"] 
    });