nano-run/_docs/flow.md

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# High-level overview
Subjects:
* Client - the side which is making HTTP(S) request to the System
* System - instance of nano-run that routing request
* Worker - executable that implements business logic
During restart - all incomplete tasks will queued again.
![image](https://user-images.githubusercontent.com/6597086/92712138-d8b58580-f38b-11ea-8a26-251df5c4ae13.png)
![image](https://user-images.githubusercontent.com/6597086/92578247-3085bb00-f2be-11ea-87de-e2c9d94a21fa.png)
Worker will call upstream with additional headers:
- `X-Correlation-Id` - request id
- `X-Attempt-Id` - attempt id
- `X-Attempt` - attempt num