In short
The REST constraint that each request must contain all the information needed to process it — the server shouldn't rely on memory of previous requests.
How to learn this
- 1Identify what data a stateless API must include in every request (e.g. auth tokens).
- 2Learn why statelessness is what makes APIs horizontally scalable.
- 3Compare a stateless REST API to a stateful, session-based server.
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