What Are Idempotent HTTP Methods?
Idempotent HTTP methods
An idempotent HTTP method is a method that can be called multiple times with the same input and produce the same result, without changing the state of the server.
Idempotency essentially means that the result of a successfully performed request does not depend on the amount of its execution. For example, in arithmetic, adding zero to a number is an idempotent operation.
Why do we need Idempotency?
API consumers can make mistakes and write the client code in such a way that there can be duplicate requests coming to the API. Idempotency is needed to make APIs fault-tolerant so that duplicated requests do not leave the system unstable.
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