For this issue: https://github.com/denoland/deno/issues/20355

simple-nodejs-websocket-server.js

// For this issue: https://github.com/denoland/deno/issues/20355

// Simple Node.js WebSocket server:
const WebSocket = require('ws'); // npm install ws
const wss = new WebSocket.Server({ port: 8081 });

wss.on('connection', (ws) => {
  ws.on('message', (message) => {
    console.log(`Received message: ${message.slice(0, 20)}...`);
    ws.send('success');
  });
});

// Then create a wss tunnel to it with `cloudflared` (it's a one-liner, no account/sign-up needed): https://developers.cloudflare.com/cloudflare-one/connections/connect-networks/do-more-with-tunnels/trycloudflare/
// Just download the `cloudflared` binary and run:
//     cloudflared tunnel --url http://localhost:8081



// The server isn't actually relevant for this issue, but you can of course also use Deno with std/http:
// import { serve } from "https://deno.land/std@0.184.0/http/mod.ts";
// serve((req) => {
//   if(req.headers.get("upgrade") != "websocket") return new Response(null, { status: 501 });
//   const { socket: ws, response } = Deno.upgradeWebSocket(req);
//   ws.onmessage = (message) => {
//     console.log(`Received message: ${message.slice(0, 20)}...`);
//     ws.send('success');
//   };
//   return response;
// }, { port: 8081 });



// Or use Deno with `npm:ws`:
// const { WebSocketServer } = await import('npm:ws');
// const wss = new WebSocketServer({ port: 8081 });
// wss.on('connection', (ws) => {
//   ws.on('message', (message) => {
//     console.log(`Received message: ${message.slice(0, 20)}...`);
//     ws.send('success');
//   });
// });