HTTP 203 status code

203 Non-Authoritative Information

The server has successfully processed the request, but the entity header metainformation returned is not a determined set valid on the original server, but a copy from a local or third party. The current information may be a subset or a superset of the original version. For example, containing metadata for a resource may result in the origin server knowing a superset of the metainformation. Using this status code is not required and is only appropriate if the response would have returned 200 OK without this status code.