HTTP 308 Permanent Redirect indicates that the resource the client is trying to access has been permanently moved to a new URL. When faced with an HTTP 308 error, the client should use the same request method and body when requesting the resource from the new URL.
This is in contrast to the 301 Status code “Moved Permanently,” where, if the initial request was POST, the browser can redirect the request to GET, for example. If this was not intended, then data can be lost from the POST method.