我為用戶身份驗證編寫套接字中間件，但我不知道我的問題是什么！在 android 端“未經(jīng)授權(quán)”事件未調(diào)用。服務(wù)器端 ：async function (socket, next) {        if (socket.handshake.query && socket.handshake.query.token) {        jwt.verify(socket.handshake.query.token, process.env.SECRET_JWT_KEY, function (err, decoded) {            if (err) {                socket.emit( "unauthorized",  "unauthorized user") <==send to sender you'r authentication is failed                 console.log("Query: ", "unauthorized");    <==This line is lunched                return next(new Error('Authentication error'));            }            socket.decoded = decoded;            next();        });    } else {        next(new Error('Authentication error'));    }客戶端 ：   val socket = IO.socket("http://192.168.1.6:3000", IO.Options().apply {                path = "/sockets/chat"                query = "token=wrongtoken"            })  socket.on("unauthorized", object : Emitter.Listener { <== THIS NOT LUNCED!!                override fun call(vararg args: Any?) {                  println("user authentication failed" )                }            }