HTTP/1.1 500 Internal Server Error
Content-Type: application/xml
Content-Length: 121
Date: Mon, 28 Nov 2011 18:19:37 GMT

<instanceFault code="500" xmlns="http://docs.openstack.org/database/api/v1.0">
    <message>
        The server has either erred or is incapable of performing the requested operation.
    </message>
</instanceFault>