Implementé mi servidor de socket NodeJs con pm2 y apache, y obtuve el error No hay 'Access-Control-Allow-Origin' header is present on the requested resource. cuando se llama desde mi aplicación angular. Este problema aparece solo cuando uso el nombre de dominio que apunta al proceso. Cuando se usa http://<ip_address>:<port> , funciona.

código angular

 setupScheduleSocket(){ this.scheduleSocket = io.connect(environment.SCHEDULE_SOCKET); this.scheduleSocket.on('connect', ()=>{ console.log("connected", environment.SCHEDULE_SOCKET); }); this.scheduleSocket.on('connect_error', () => { console.log('connection error'); }); this.scheduleSocket.on('disconnect', () => { console.log('disconnected'); }); }

NodeJs

 const https = require('http'); //const server = https.createServer(); const socketIO = require('socket.io'); const server = https.createServer((req, res) => { const headers = { 'Access-Control-Allow-Origin': '*', 'Access-Control-Allow-Methods': 'OPTIONS, POST, GET', 'Access-Control-Max-Age': 2592000, 'Access-Control-Allow-Headers': 'X-Requested-With, Content-Type', 'Access-Control-Allow-Credentials': true }; if (req.method === 'OPTIONS') { res.writeHead(204, headers); res.end(); return; } if (['GET', 'POST'].indexOf(req.method) > -1) { res.writeHead(200, headers); res.end('Hello World'); return; } res.writeHead(405, headers); res.end(`${req.method} is not allowed for the request.`); }); /* socket */ io = socketIO(server); io.on('connection', (socket) => { console.log("connected"); socket.on('refresh-user', (data)=>{ io.emit('refresh-user', data); console.log(data); }); }); server.listen(6900, ()=> { console.log('listening on 6900'); });