Spotify does not accept localhost and hyphens

[matndev]

Bug Description

Requirements from Spotify :

• Use HTTPS for your redirect URI, unless you are using a loopback address, when HTTP is permitted.
  

• If you are using a loopback address, use the explicit IPv4 or IPv6, like http://127.0.0.1:PORT or http://[::1]:PORT as your redirect URI.
  

• localhost is not allowed as redirect URI.
  

https://developer.spotify.com/documentation/web-api/concepts/redirect_uri

So I changed localhost to 127.0.0.1 but now the hyphens seems causing problems :
https://community.spotify.com/t5/Spotify-for-Developers/Local-Redirect-URI-does-not-accept-hyphen-minus/td-p/6929053

Even if the team said the issue was fixed I'm still facing this problem.

To Reproduce

1. Select Spotify component in n8n and use http://localhost:5678/rest/oauth2-credential/callback as callback
2. Add same URI in Spotify app configuration
3. Try "Connect my account" in n8n

Expected behavior

I should be connected

Debug Info

I get this error : INVALID_CLIENT: Invalid redirect URI

Operating System

Windows 11

n8n Version

2.4.5

Node.js Version

24.13.0

Database

SQLite (default)

Execution mode

main (default)

Hosting

self hosted

[n8n-assistant]

Hey @matndev,

Thank you for reaching out! We’ve received your issue and are looking into it. To help us track this internally, we’ve created a Linear ticket with the reference: "GHC-6856".

We’ll keep you updated as we make progress, but if you have any additional details or context to share, feel free to add them here - it’s always helpful!

Thanks for your patience and for bringing this to our attention.

---

For INTERNAL use only: GHC-6856

[Joffcom]

Hey @matndev

Spotify doesn't allow localhost, instead can you try setting webhook_url to http:/:127.0.0.1:5678 and seeing if that works

[matndev]

I added variable environment : WEBHOOK_URL=http://127.0.0.1:5678 to the docker image and it works now

[Joffcom]

@matndev perfect, I will mark this as closed.