OAuth Redirect URL Error in Production Deployment (Railway)

[afaqulislam]

🧩 Issue: OAuth Redirect URL Error in Production Deployment (Railway)

Description:
I have successfully implemented Chainlit OAuth authentication using Google and GitHub on my local environment — everything works perfectly when running locally.

However, when I deploy the same project on Railway, the OAuth authentication fails with the following error:

redirect_uri_mismatch or “redirect URL incorrect”

This issue occurs despite setting the correct callback URLs in both the Chainlit configuration and the OAuth provider settings.

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⚙️ Configuration Details

Local setup (working):

• http://localhost:8000/auth/oauth/github/callback
• http://localhost:8000/auth/oauth/google/callback

Production setup (failing):

• https://afaqulislam-chainlit.up.railway.app/auth/oauth/github/callback
• https://afaqulislam-chainlit.up.railway.app/auth/oauth/google/callback

Environment Variables:

OAUTH_GITHUB_CLIENT_ID=xxxxxxxxxxxxxxxxx
OAUTH_GITHUB_CLIENT_SECRET=xxxxxxxxxxxxxxxxx

OAUTH_GOOGLE_CLIENT_ID=xxxxxxxxxxxxxxxxx
OAUTH_GOOGLE_CLIENT_SECRET=xxxxxxxxxxxxxxxxx

CHAINLIT_AUTH_SECRET=xxxxxxxxxxxxxxxxx

🚀 What I’ve Tried

• Verified callback URLs in GitHub Developer Settings and Google Cloud Console — they match exactly.
• Redeployed the app multiple times to ensure environment variables are loaded correctly.
• Tested both domain variations (with and without trailing slashes). * Tried manually updating the redirect_uri, but the same error persists.

❓Question

Is there any additional configuration required when deploying Chainlit with OAuth on Railway or similar hosting platforms?
For example, do I need to explicitly define a base URL or set an environment variable like CHAINLIT_AUTH_OAUTH_REDIRECT_URL in production?

[themrcesi]

Don't know if this would fix your issue, but have you set the CHAINLIT_URL env variable to https://afaqulislam-chainlit.up.railway.app?

CHAINLIT_URL=https://afaqulislam-chainlit.up.railway.app