I found this at web-sniffer.net:

Date: Mon, 19 Jun 2006 21:07:06 GMT
Set-Cookie: PHPSESSID=4d0cfb1b0b27fd571b993a52bfce9285; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: private
Pragma: no-cache

Is the Expires parameter correct?