# Page Not Found

The URL `l402` does not exist.

You might be looking for one of these pages:
- [L402: Lightning HTTP 402 Protocol](https://docs.lightning.engineering/the-lightning-network/l402.md)
- [L402](https://docs.lightning.engineering/the-lightning-network/l402/l402.md)
- [L402 Quickstart](https://docs.lightning.engineering/the-lightning-network/l402/l402-quickstart.md)
- [LND](https://docs.lightning.engineering/lightning-network-tools/lnd.md)
- [Loop](https://docs.lightning.engineering/lightning-network-tools/loop.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://docs.lightning.engineering/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://docs.lightning.engineering/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/the-lightning-network/l402.md`)
- Use `Accept: text/markdown` header for content negotiation