ys contains a full resource. This is necessary because, a necessary quality of PUT requests is idempotence — the quality of producing t…n, it’ll simply PUT the resource at the location. In this case, a full prefabricated house. Thus, a PUT request always contains a full resource. This is necessary because, a necessary quality of PUT requests is idempotence — the quality of producing the same result even if the same request is made multiple times.