301 Moved Permanently: The link target was moved such that the request and future similar requests should be redirected to the given URI. If a client has link-editing capabilities, it should update references to the request URL. The response is cacheable unless indicated otherwise. Except for a GET request, the body should contain a hyperlink to the new URL(s). Except for a GET or HEAD request, the client must ask the user before redirecting. This code is considered best practice for upgrading users from HTTP to HTTPS. Both Bing and Google recommend using this code to change the URL of a page as it is shown in search engine results, providing that URL will permanently change and is not due to be changed again any time soon.