Error during WebSocket handshake: Unexpected response code: 502

在web页面可以连接：

代码：

import VueWebsocket from "vue-websocket"; Vue.use(VueWebsocket, "wss://xxx.com/socket", {     reconnection: false });

服务端实现：

var http = require('http').Server(express) var io = require('socket.io')(http)   io.on('connection', function (socket) {     console.log('a client connected')     socket.emit('news', { hello: 'world' }) })   http.listen(config.io.port, function () {     console.log('listening on *:' + config.io.port) })

小程序代码：

wx.connectSocket({     url: 'wss://xxx.com/socket',     success: function (res) {        console.log(res)     } })