# Page Not Found

The URL `custom-token-authentication` does not exist.

You might be looking for one of these pages:
- [Custom Token Authentication](https://chat-sdk.gitbook.io/chat-sdk/guides/custom-token-authentication.md)
- [Custom File Upload Handler](https://chat-sdk.gitbook.io/chat-sdk/guides/custom-file-upload-handler.md)
- [Backend Agnostic Architecture](https://chat-sdk.gitbook.io/chat-sdk/architecture/backend-agnostic-architecture.md)
- [Best Practices and Troubleshooting](https://chat-sdk.gitbook.io/chat-sdk/guides/best-practices-and-troubleshooting.md)
- [Module Licensing](https://chat-sdk.gitbook.io/chat-sdk/commercial/module-licensing.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://chat-sdk.gitbook.io/chat-sdk/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://chat-sdk.gitbook.io/chat-sdk/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/chat-sdk/guides/custom-token-authentication.md`)
- Use `Accept: text/markdown` header for content negotiation