nginx 0.8.53/0.7.67 unable to return 304

[rchen9012]

here is the request and response header

User-Agent	Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.12)
Gecko/20101026 Firefox/3.6.12
Accept	image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language	en-us,en;q=0.5
Accept-Encoding	gzip,deflate
Accept-Charset	ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive	115
Connection	keep-alive
If-Modified-Since	Fri, 10 Sep 2010 00:10:07 GMT
Cache-Control	max-age=0

Server	nginx
Date	Tue, 09 Nov 2010 22:26:50 GMT
Content-Type	image/gif
Content-Length	5541
Last-Modified	Fri, 10 Sep 2010 00:10:07 GMT
Connection	keep-alive
Expires	Wed, 10 Nov 2010 22:26:50 GMT
Cache-Control	max-age=86400
Accept-Ranges	bytes

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,149315,149316#msg-149316