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sortafreel merged 1 commit into from
Apr 1, 2026
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feat: Add troubleshooting case for 431 #1419

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4 changes: 4 additions & 0 deletions docs/LOCAL-DEVELOPMENT.md
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Expand Up @@ -101,6 +101,10 @@ Ensure your local PostHog instance is running at `http://localhost:8010` and tha

After connecting, PostHog Code will show projects from your local PostHog instance. If you need test data, run `python manage.py generate_demo_data` in your PostHog repo.

### 431 error

Clean up `localhost` cookies in your browser, as you probably accumulated too many/large cookies for the server to accept as the request headers.

## Further reading

- [PostHog OAuth Development Guide](https://github.com/PostHog/posthog/blob/master/docs/published/handbook/engineering/oauth-development-guide.md) — full OAuth spec, scopes, token introspection, and more
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