Pass the baton with next()

1const http = require('node:http');2const chain = [3  (req, res, next) => { console.log('a before'); next(); console.log('a after'); },4  (req, res, next) => { console.log('b before'); next(); console.log('b after'); },5  (req, res) => { console.log('handler'); res.end('ok'); },6];7function run(req, res, i) {8  chain[i](req, res, () => run(req, res, i + 1));9}10const server = http.createServer((req, res) => run(req, res, 0));11server.listen(0, async () => {12  const { port } = server.address();13  const r = await fetch(`http://localhost:${port}`);14  console.log('client got ' + await r.text());15  server.close();16});