Explain the concept of 'idempotence' in the context of RESTful API design, and provide a specific example of a request that should be idempotent.

In the context of RESTful API design, idempotence means that performing the same request multiple times has the same effect as performing it once. In other words, whether you call the API endpoint once or multiple times in a row, the end result on the server should be the same. This is important for reliability and fault tolerance, as it allows clients to safely retry requests without causing unintended side effects. Idempotent methods do not necessarily return the same response on subsequent requests (although they can), but they must ensure that the state of the serv....