OAuth Redirect URL Missing HTTPS Protocol

Questions
1

Hi,

I’m having an issue with Google Sheets OAuth2 authentication. The OAuth redirect URL is generated without the https:// protocol, causing Google to return “Error 400: invalid_request”.

Current (Wrong): n8n.[domainname].com/rest/oauth2-credential/callback
Expected (Correct): https://n8n``.[domainname].com/rest/oauth2-credential/callback

I’m running n8n via Coolify with reverse proxy (no port in URL). I’ve restarted the service multiple times and recreated credentials, but the issue persists.

What am I missing? How can I force n8n to generate the OAuth URL with https://?

Thanks!

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2

Check the enviroment variables, N8N_HOST, and N8N_PUBLIC_NODE_BASE_URL (this one can be the issue here and maybe missing the “https://”)

3

Hi everyone,

I wanted to share the solution that finally worked for me regarding the OAuth redirect URL missing the https:// protocol issue.

Solution:

Instead of using the Environment Variables section in Coolify, I had to directly edit the Compose File:

  1. Go to General > Edit Compose File

  2. Add/modify these environment variables in the compose file:

- 'N8N_EDITOR_BASE_URL=https://n8n.yourdomain.com'
- 'WEBHOOK_URL=https://n8n.yourdomain.com'
- 'N8N_HOST=https://n8n.yourdomain.com'

Important: After making these changes, simply restarting is not enough. You need to:

  1. Stop the service completely

  2. Deploy it again

After redeploying, the OAuth redirect URL was generated correctly with https:// and Google Sheets authentication worked perfectly!

Hope this helps anyone facing the same issue with Coolify deployments.

2 Likes
4

Hey @isa_yilmaz,

To simplify this you only need to set WEBHOOK_URL unless you are planning to use a differnet url for the n8n editor.