Indicates that the resource requested is no longer available and will not be available again. This should be used when a resource has been intentionally removed and the resource should be purged. Upon receiving a 410 status code, the client should not request the resource in the future. Clients such as search engines should remove the resource from their indices.[41] Most use cases do not require clients and search engines to purge the resource, and a '404 Not Found' may be used instead.