Express.js上的Socket.io间歇性连接错误

Question

我正在将express.server与socket.io配合使用，并响应应用程序。代码正常工作，并且按预期方式发送/接收数据，但我一直注意到控制台中的连接错误：

1. 与'ws：//192.168.1.102：3000 / sockjs-node / 351 / m2x50td4 / websocket'的WebSocket连接失败：在建立连接之前已关闭WebSocket。

2. 与'ws：/socket.io/？EIO = 3＆transport = websocket'的WebSocket连接失败：WebSocket在建立连接之前已关闭。

3. websocket.js：118到'ws：//192.168.1.102：3000 / socket.io /？EIO = 3＆transport = websocket＆sid = fNkATGvOmjkq9po1AAAE'的WebSocket连接失败：连接已关闭，但未收到握手响应

Errors

Express Server

const express = require('express');
const port = 5000;

const app = require('express')();
const server = require('http').createServer(app);
const io = require('socket.io')(server, {'transports': ['websocket', 'polling']});


// WebSocket handlers
io.on('connection', (client) => {

  console.log('Websocket: New connection from'+ client.request.connection.remoteAddress);

  client.on('setSwitchState', function (data, fn) {
    switchController.setSwitch(data);
    fn(data['jstate']);
  });

  client.on('disconnect', () => {
  console.log('user disconnected');
  })

});

server.listen(port, () => console.log(`Listening on port ${port}`));

反应应用

import React, { Component } from "react";

import io from 'socket.io-client';
const socket = io();
 
class ToggleSwitch extends Component {

	socket.emit('setSwitchState', sendata, (data) => {
		this.setState({checked: data});
	});
  } 
}

export default (ToggleSwitch);