client.js

const WebSocket = require('ws');

const ws = new WebSocket(`wss://${process.argv[2]}/`, {
  origin: `https://${process.argv[2]}`
});

ws.on('open', function open() {
  console.log('connected');
  ws.send(Date.now());
});

ws.on('close', function close() {
  console.log('disconnected');
});

ws.on('message', function incoming(data) {
  console.log(`ping`);

  setTimeout(function timeout() {
    ws.send(Date.now());
  }, 500);
});

index.js

const WebSocket = require('ws');

const http = require('http');
const server = http.createServer((req, res) => {
  console.log(req.headers)
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.end('okay');
});

  http.createServer();
const wss = new WebSocket.Server({ server });

wss.on('connection', function connection(ws, req) {
  console.log('connection')
  console.dir(req.headers)
  ws.on('message', function incoming(message) {
    console.log('received: %s', message);
  });

  ws.send('something');
});

server.listen(3000)

package.json

{
  "name": "ws-testing",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "node index.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "Jarmo Isotalo <[email protected]>",
  "license": "MIT",
  "dependencies": {
    "ws": "6.0.0"
  }
}