Chained Listen

The chained-binding server idiom: listen returns the server, the handle is bound before the ready callback fires, and the ephemeral port (listen 0) is read back via server.address. Self-contained: the program makes one request against itself and closes.

import http from 'http'
import type { AddressInfo } from 'net';
import { mustCall } from 'test'

const server = http.createServer(mustCall((req, res) => {
  res.end("hello from " + req.url)
})).listen(0, mustCall(() => {
  const port = (server.address() as AddressInfo).port
  console.log("bound an ephemeral port:", port > 0)
  http.get({ port: port, path: "/thessaloniki" }, mustCall((res) => {
    let data = ""
    res.on('data', (chunk: string) => { data = data + chunk })
    res.on('end', () => { console.log("response:", data) })
    server.close()
  }))
}))

View source on GitHubexamples/http/chained_listen.ts

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