Problem with X OAuth API Callback

[mateinovac]

Bug Description

The latest n8n self-hosted version has an error with the X OAuth API callback, it returns a 401 code even though the app is set up correctly.

To Reproduce

Steps:

1. Create an X app from https://developer.x.com/en
2. Set up the callback URL for the X OAuth App - https://{domain}/rest/oauth1-credential/callback
3. Get the API Key and the API Secret and create a credential on n8n
4. Authorize the app and connect with your X account
5. You should get this error (Code 401) - I've only tried this on the self-hosted version, so I don't know if this also occurs on the cloud version.

Details for this to work:

I use the latest n8n version
I use the self-hosted version

Expected behavior

You'll get an 401 code error - it's an problem from the server it doesn't handles the callback correctly

Operating System

docker (self-hosted)

n8n Version

1.72.1

Node.js Version

20.18.0

Database

SQLite (default)

Execution mode

main (default)

[Joffcom]

Hey @mateinovac,

We have created an internal ticket to look into this which we will be tracking as "N8N-8009"

[muditjuneja]

I can confirm that I am getting the same error. I believe the issue is with the redirect url that the tab/popup opens with. In my case, it starts with http://localhost:5678/rest/oauth2-credential/callback which doesn't make sense as I am behind a reverse proxy. Is there a env variable that changes this behavior that i am missing out?

Exact error -