1.Backend socket.io configuration

//app.js文件部分代码... app.use(function (req, res, next) { const origin = req.headers.origin if (typeof origin === 'undefined') { // No Cross Origin redirect res.header('Access-Control-Allow-Origin', '*') } else if ( (origin.indexOf('http://localhost')) === 0 || (origin.indexOf('http://172.16.') === 0) || (origin.indexOf('http://192.168.1.') === 0) || (origin.indexOf('http://admin.anguer.com') === 0) || (origin.indexOf('http://chat.anguer.com') === 0) ) { res.header('Access-Control-Allow-Origin', origin) res.header('Access-Control-Allow-Credentials', 'true') } else { res.header('Access-Control-Allow-Origin', 'http://localhost') } res.header('Access-Control-Allow-Methods', 'POST, GET, OPTIONS, PUT, DELETE') res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept, Accept-Encoding, X-Access-Token') next() })

// bin/www const app = require('../src/app') const http = require('http') app.set('port', 12345) const server = http.createServer(app) const _io = require('socket.io')(server) _io.set('transports', ['websocket', 'xhr-polling', 'jsonp-polling', 'htmlfile', 'flashsocket']); _io.set('origins', '*:*'); _io.of('/socket-server').on('connection', function (socket) { // do something... })

2. Front-end connection

const socket = io('domain.com:12345')

3. Error message

No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8080' is therefore not allowed access.