Subdomains on localhost return ENOTFOUND on some OS.

Version

Tested on v21.2.0, v20.9.0, v18.18.2

Platform

Microsoft Windows NT 10.0.19045.0 x64

Subsystem

No response

What steps will reproduce the bug?

1. run fetch("http://test.localhost/")

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

Happens on windows every time

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

Expected behaviour is ECONNREFUSED or content of what the webpage contains equally to how a node on Linux, cURL or a browser would handle it

What do you see instead?

Uncaught [TypeError: fetch failed] {
  cause: Error: getaddrinfo ENOTFOUND test.localhost
      at GetAddrInfoReqWrap.onlookupall [as complete] (node:dns:118:26)
      at GetAddrInfoReqWrap.callbackTrampoline (node:internal/async_hooks:130:17) {
    errno: -3008,
    code: 'ENOTFOUND',
    syscall: 'getaddrinfo',
    hostname: 'test.localhost'
  }
}

Additional information

Recreated locally in a VM but also on an actual Windows device

まず Windows で fetch("http://test.localhost/") を再現し、test.localhost に対して ENOTFOUND を発生させる node:dns の名前解決パスを調査します。Linux、cURL、またはブラウザーと動作を比較し、Windows の動作が期待される localhost の処理と一致し、リグレッションカバレッジが追加された時点で issue の完了とします。