Como você confirma quais cabeçalhos estão sendo enviados quando você acessa o / URL? Você pode tentar este comando curl?
Algo parecido com isto, mas com o seu URL:
% curl -I www.google.com
HTTP/1.1 200 OK
Date: Thu, 17 Jan 2013 18:58:36 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Set-Cookie: PREF=ID=39403a60450f4bb3:FF=0:TM=1358449116:LM=1358449116:S=uoBAz3VFZpjyc1hA; expires=Sat, 17-Jan-2015 18:58:36 GMT; path=/; domain=.google.com
Set-Cookie: NID=67=MBsS_mn5gvM2Zzt6Q6kfIO5h_brntWLnAmxZAXsNPseUgb5puv_8p8Io0ybgRqY62z0ihF-G5DLFtQOMN5MyIzM70IgPbkN4qOXKhCnQuUUqGCyuKkCg5XL6WfZoDR9m; expires=Fri, 19-Jul-2013 18:58:36 GMT; path=/; domain=.google.com; HttpOnly
P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Transfer-Encoding: chunked