HTTP/1.1 200 OK
Server: DPS_PX_SERVER
Cache-Control: private
Content-Length: 51
Content-Type: application/xhtml+xml; charset=utf-8
Expires: Sat, 23 Feb 2013 14:54:40 GMT
Date: Sat, 23 Feb 2013 14:55:40 GMT

<Request valid="0"><URI>Invalid Key</URI></Request>