socket.js, sse,js

+const SocketIO = require('socket.io');
+
+module.exports = (server, app) => {
+  const io = SocketIO(server, { path: '/socket.io' });
+
+  app.set('io', io);
+
+  io.on('connection', (socket) => {
+    const req = socket.request;
+    const { headers: { referer } } = req;
+    const roomId = referer.split('/')[referer.split('/').length - 1];
+    socket.join(roomId);
+    socket.on('disconnect', () => {
+      socket.leave(roomId);
+    });
+  });
+};

+const SSE = require('sse');
+
+module.exports = (server) => {
+  const sse = new SSE(server);
+  sse.on('connection', (client) => {
+    setInterval(() => {
+      client.send(Date.now().toString());
+    }, 1000);
+  });
+};