`req.getHeaders()` does not return values set using "rawHeaders" array

Version

v24.18.0

Platform

Darwin MBPM.local 25.5.0 Darwin Kernel Version 25.5.0: Tue Jun  9 22:28:29 PDT 2026; root:xnu-12377.121.10~1/RELEASE_ARM64_T6030 arm64

Subsystem

http

What steps will reproduce the bug?

Headers set using the message.rawHeaders format are not available on the request's getHeaders() method

import { get } from 'node:http'

const request = get(
  'http://localhost:3000',
  {
    headers: ['foo', 'bar', 'baz', 'qux']
  },
  (res) => {
    let data = ''

    res.on('data', (chunk) => {
      data += chunk
    })

    res.on('end', () => {
      console.log(data)
    })
  }
)

request.on('error', () => {})

console.log(request.getHeaders()) // [Object: null prototype] {}
console.log(request.getHeaderNames()) // []
console.log(request.getRawHeaderNames()) // []
console.log(request._header) // GET / HTTP/1.1\r\nfoo: bar\r\nbaz: qux\r\nConnection: keep-alive

How often does it reproduce? Is there a required condition?

Always

What is the expected behavior? Why is that the expected behavior?

One would expect req.getHeaders() (and friends) to return a consistent value, whether an object or an array was passed as argument.

What do you see instead?

req.getHeaders() appears to be empty when request options are built using an array notation.

Additional information

No response

Start at the node:http request entry point and trace how the options.headers array is stored before getHeaders(), getHeaderNames(), and getRawHeaderNames() are called. Reproduce the example, then verify that these methods report the headers consistently with object-form options while preserving the emitted request headers.