Unable to proxy connections with net.connect followed by http.request

[mattfysh]

What version of Bun is running?

1.1.43+76800b049

What platform is your computer?

Darwin 24.1.0 arm64 arm

What steps can reproduce the bug?

import net from 'node:net'
import http from 'node:http'

const url = new URL(process.env.URL)
const proxy = new URL(process.env.PROXY_CONN)
const auth = `${proxy.username}:${proxy.password}`

const socket = net.connect({
  host: proxy.hostname,
  port: Number.parseInt(proxy.port ?? (proxy.protocol === 'http:' ? 80 : 443)),
})

await new Promise((resolve, reject) => {
  socket.on('error', reject)
  socket.on('timeout', reject)
  socket.on('connect', resolve)
})
console.log("Socket connected")

const req = http.request({
  path: `${url.origin}${url.pathname}`,
  headers: {
    "host": url.hostname,
    "proxy-authorization": `Basic ${Buffer.from(auth).toString('base64')}`,
  },
  createConnection: () => socket,
})

const res = await new Promise((resolve, reject) => {
  req.on('response', async res => {
    res.on('error', reject)
    resolve(res)
  })
  req.on('error', reject)
  req.on('timeout', reject)
  req.end()
})

const body = await new Response(res).text()
console.log(body)

What is the expected behavior?

The http request should be proxied through the proxy socket, and return the remote response.

What do you see instead?

Socket connected
error: Unable to connect. Is the computer able to access the url?
  path: "http://lumtest.com/echo.json",
 errno: 0,
  code: "ConnectionRefused",

Additional information

Manually proxying requests via net.connect works without issue in node.js