Are you familiar with the idempotency of a method?

Idempotency of a method means that multiple executions of the same request or operation lead to the same result, without side effects after the first call.

For example, the HTTP GET method is idempotent — repeated requests do not change the server state. The PUT method is also idempotent, as it updates a resource to a certain state, and repeated calls with the same data will not change the result.

In testing, it is important to verify idempotency to ensure that repeated calls do not cause unexpected changes or errors.