direct access:
GET /forums/view-topic.php?id=51 HTTP/1.1

HTTP/1.1 200 OK
Transfer-Encoding: chunked
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Type: text/html; charset=iso-8859-1
Date: Sun, 29 Jul 2007 18:06:48 GMT
Server: lighttpd

access thru application UI:

GET /forums/view-topic.php?id=51 HTTP/1.1

HTTP/1.1 302 Found
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Type: text/html; charset=iso-8859-1
Location: /
Content-Length: 0
Date: Sun, 29 Jul 2007 18:10:12 GMT
Server: lighttpd