GitHub OAuth Redirect URI Error in Django-allauth

The error you're seeing indicates a mismatch between the redirect URI you're sending to GitHub and the redirect URIs you've registered in your GitHub OAuth application settings.

The Problem

GitHub is rejecting your authentication request because the redirect URI in your request (http://localhost:8000/accounts/github/login/callback/) doesn't match any of the redirect URIs you've configured in your GitHub OAuth application.

How to Fix It

1. Update your GitHub OAuth application settings:

   • Go to your GitHub account settings
   • Navigate to Developer settings > OAuth Apps > Your App
   • In the "Authorization callback URL" field, add http://localhost:8000/accounts/github/login/callback/
   • Save your changes

2. Alternatively, modify your Django settings:
   If you need to use a different callback URL than what's configured in GitHub, you can update your Django-allauth settings to match the URL you've registered with GitHub.

3. Check for protocol mismatches:

   • Ensure you're using the correct protocol (http vs https)
   • GitHub is strict about exact matches, including trailing slashes

4. Verify your settings.py configuration:

   PYTHONCopied
   INSTALLED_APPS = [
       # ...
       'django.contrib.sites',
       'allauth',
       'allauth.account',
       'allauth.socialaccount',
       'allauth.socialaccount.providers.github',
       # ...
   ]
   
   SITE_ID = 1  # Make sure this is set correctly

5. Check your site domain in the admin:

   • Go to your Django admin
   • Navigate to Sites
   • Ensure the domain for your site ID matches what you're using (e.g., localhost:8000)

Important Notes

• GitHub OAuth requires exact matching of redirect URIs
• The error message clearly shows the URI that was rejected (http://localhost:8000/accounts/github/login/callback/)
• Make sure you're using the same URI format in both GitHub and your application

This is a common issue with OAuth implementations and is typically resolved by ensuring the redirect URIs are properly synchronized between your application and the OAuth provider (GitHub in this case).