Which HTTP methods are considered idempotent?

Idempotent HTTP methods are those that can be called multiple times with the same effect as making a single call. Specifically, if an operation is idempotent, repeating it does not change the result beyond the initial application.

The correct choice identifies the Put method as idempotent because it is designed to update a resource at a specific URI with a new representation. If a client sends the same Put request multiple times, the resource's state remains the same after the first request—subsequent requests don’t alter the outcome.

Similarly, the Delete method is also idempotent because deleting the same resource multiple times will still yield the same result—the resource will be deleted after the first request, and further calls will not change anything since the resource is no longer present.

Post, on the other hand, is typically not considered idempotent. It is used to create new resources, and each call can result in a new resource being created, which changes the state of the server with every request.

Read methods refer to the retrieval of data, such as the GET method, which is also idempotent; however, it is not one of the options provided. Thus, when examining the provided choices, the answer that aligns with the principle of id