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api-guidelines/core-principles/robustness.md
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# Robustness
Every API implementation and API consumer **MUST** follow Postel's law:
> _Be conservative in what you send, be liberal in what you accept._
>
> _ [John Postel](https://en.wikipedia.org/wiki/Robustness_principle)_
That is, send as little as possible and be tolerant as possible while consuming another service ([tolerant reader](https://martinfowler.com/bliki/TolerantReader.html)).