NextResponse.redirect() behaves incorrectly when redirecting from subdomain route to apex domain route

[bentron2000]

Link to the code that reproduces this issue

https://github.com/bentron2000/next-response-bug-report

To Reproduce

Set /etc/hosts:

127.0.0.1 example.test
127.0.0.1 foo.example.test

Install Packages:

npm i

Start Server:

npm run dev

Then Navigate to the following link and observe the result.
'http://foo.example.test:3000/shouldredirect'

Current vs. Expected behavior

When you navigate to the 'http://foo.example.test:3000/shouldredirect'
Middleware should select for this route and redirect to the apex domain '/login' page

Expected Result:
Redirect to : 'http://example.test:3000/login' -> 'Hooray - we redirected properly'

Actual Result:
Redirect to : 'http://foo.example.test:3000/login' -> 'Should not be redirected here'

Provide environment information

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.2.0: Fri Dec  6 18:51:28 PST 2024; root:xnu-11215.61.5~2/RELEASE_ARM64_T8112
  Available memory (MB): 16384
  Available CPU cores: 8
Binaries:
  Node: 20.10.0
  npm: 10.8.1
  Yarn: 1.22.22
  pnpm: 9.15.0
Relevant Packages:
  next: 15.2.0-canary.19 // Latest available version is detected (15.2.0-canary.19).
  eslint-config-next: N/A
  react: 19.0.0
  react-dom: 19.0.0
  typescript: 5.7.3
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

Middleware

Which stage(s) are affected? (Select all that apply)

next dev (local)

Additional context

Minimal demo of possible middleware NextResponse.redirect() Bug

Demonstrates that NextResponse.redirect is not obeying explicit urls when redirecting from a subdomain foo.example.test to the apex domain example.test

In this example, middleware has been set to catch a specific subdomain route and to redirect it to an explicitly set route on the apex domain
'http://foo.example.test:3000/shouldredirect' -> 'http://example.test:3000/login'

This does not happen - it redirects to the same path but on the subdomain.

To Reproduce

Set /etc/hosts:

127.0.0.1 example.test
127.0.0.1 foo.example.test

Install Packages:

npm i

Start Server:

npm run dev

Then Navigate to the following link and observe the result.
'http://foo.example.test:3000/shouldredirect'

Middleware should select for this route and redirect to the apex domain '/login' page

Expected Result:
Redirect to : 'http://example.test:3000/login' -> 'Hooray - we redirected properly'

Actual Result:
Redirect to : 'http://foo.example.test:3000/login' -> 'Should not be redirected here'

[icyJoseph]

I think there has been a fix related to this issue, #64604, but it requires setting a basePath IIRC, which is not ideal... somewhat related discussion here, #74732