# Page Not Found

The URL `tutorial/lesson-1-messaging-concepts` does not exist.

You might be looking for one of these pages:
- [Messaging concepts](https://docs.ecotone.tech/messaging/messaging-concepts.md)
- [Lesson 1: Messaging Concepts](https://docs.ecotone.tech/tutorial-php-ddd-cqrs-event-sourcing/php-messaging-architecture.md)
- [Extending Messaging (Middlewares)](https://docs.ecotone.tech/modelling/extending-messaging-middlewares.md)
- [Messaging Gateway](https://docs.ecotone.tech/messaging/messaging-concepts/messaging-gateway.md)
- [Message](https://docs.ecotone.tech/messaging/messaging-concepts/message.md)

## How to find the correct page

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

## Tips for requesting documentation

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