I figured out that it must be something with headers. Does anybody knows why nginx ignores cache with those headers?

[code]
Server nginx/0.8.53
Date Fri, 22 Oct 2010 10:16:28 GMT
Content-Type text/html; charset=ISO-8859-2
Connection keep-alive
X-Powered-By PHP/5.3.3
X-Pingback http://ls2009.eu/vbseo-xmlrpc/
Set-Cookie bb_lastvisit=1287437336; expires=Sat, 22-Oct-2011 10:16:28 GMT; path=/; domain=ls2009.eu bb_lastactivity=0; expires=Sat, 22-Oct-2011 10:16:28 GMT; path=/; domain=ls2009.eu vbseo_loggedin=deleted; expires=Thu, 22-Oct-2009 10:16:27 GMT; path=/
Cache-Control private
Pragma private
Last-Modified Wed, 20 Oct 2010 21:01:11 GMT
Vary Accept-Encoding,User-Agent
Content-Encoding gzip
Content-Length 9560
[/code]
Cache-control should be ignored according to proxy cache settings...