next/navigation redirect error with relative URL

[Crane101]

Link to the code that reproduces this issue

https://github.com/Crane101/next-15-relative-redirect-error

To Reproduce

1. Start the application using npm run dev
2. Open the root page
3. Click Start to navigate to /lng/page1
4. Click "Relative Redirect" to navigate to the relative url page2 via a server action

Current vs. Expected behavior

Expected Behaviour

The app navigates to /lng/page2

Actual Behaviour

An error is thrown: TypeError: Invalid URL

Provide environment information

Operating System:
  Platform: win32
  Arch: x64
  Version: Windows 10 Pro
  Available memory (MB): 32466
  Available CPU cores: 24
Binaries:
  Node: 20.11.1
  npm: 10.2.4
  Yarn: 1.22.22
  pnpm: 9.6.0
Relevant Packages:
  next: 15.0.4-canary.8 // Latest available version is detected (15.0.4-canary.8).
  eslint-config-next: N/A
  react: 19.0.0-rc-5c56b873-20241107
  react-dom: 19.0.0-rc-5c56b873-20241107
  typescript: 5.3.3
Next.js Config:
  output: N/A

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

Navigation

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

next dev (local)

Additional context

The documentation for the redirect function states that the url parameter "Can be a relative or absolute path.", which was the case in next 14 - but after upgrading to v15 it seems that only absolute paths will work. From the error I'm guessing that it's using the verbatim relative path to create a new URL object?

Pretty essential for my use case as there does not appear to be a way to access the current url or route parameters from a server action in order to construct an absolute version of the url.

[ztanner]

Hi @Crane101 - thanks for the report! The correct way to refer to a relative redirect here is via ./ or / or ../. There's currently a bug with ../ which will be fixed by #72770.

This used to work by accident in Next 14 but you may have noticed that it doesn't actually work correctly: it's doing a full page navigation to the destination URL rather a soft nav with streaming.

[Crane101]

Yep looking good in canary (now that I have corrected my relative paths to use ../).
Awesome response time too, thanks @ztanner 👍

[github-actions]

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