[fix] request does not support IPv6 addresses

[davidje13]

Describe the bug

Node.js version: 23.4.0

OS version: Ubuntu 24.10 / Mac OS 15.3

Description:

This line tries to set the host option in a call to http.request to the hostname from the requested URL, but URL.hostname includes [] wrapping, and http.request's host fails when this is provided:

new URL('http://[::1]:8080').hostname // [::1]

http.request({ port: 8080, host: '[::1]' }) // fails

http.request({ port: 8080, host: '::1' }) // fine

I would list this as a feature request rather than a bug, but it's clear from nearby code that IPv6 is intended to be supported already.

Code to reproduce

This was originally reported to me here davidje13/superwstest#18 and narrowed down to when supertest is invoked with an IPv6 URL. A minimal reproduction using only superagent:

import { createServer } from 'node:http';
import superagent from 'superagent';

const server = createServer((req, res) => { res.statusCode=200; res.end('hi'); });
server.listen(8080, '::1', async () => {
  await superagent.get('http://[::1]:8080');
});

Actual behavior

Error: getaddrinfo ENOTFOUND [::1]
    at GetAddrInfoReqWrap.onlookupall [as oncomplete] (node:dns:120:26) {
  errno: -3008,
  code: 'ENOTFOUND',
  syscall: 'getaddrinfo',
  hostname: '[::1]',
  response: undefined
}

Expected behavior

Successful request to server

Checklist

• I have searched through GitHub issues for similar issues.
• I have completely read through the README and documentation.
• I have tested my code with the latest version of Node.js and this package and confirmed it is still not working.

[titanism]

PR welcome