vBulletin caching proxy

[meto]

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...

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,142879,143444#msg-143444