[squid-users] A cache miss for static html page

For this page:
http://news.163.com/08/1008/09/4NNLPJAJ0001124J.html

why squid always got a cache MISS?
I'm using Squid-3.0.9.Thanks.

The response headers are like below:
(squid.mysite.com is my squid cache.)

(Status-Line) HTTP/1.0 200 OK
Age 58
Cache-Control max-age=64
Connection keep-alive
Content-Encoding gzip
Content-Length 17163
Content-Type text/html; charset=GBK
Date Wed, 08 Oct 2008 06:30:55 GMT
Expires Wed, 08 Oct 2008 06:31:59 GMT
Server nginx/0.7.10
Vary Accept-Encoding
Via 3.0 squid.mysite.com (Squid/3.0)
X-Cache MISS from cgi-gzip.163.com
X-Cache HIT from cache.163.com
X-Cache MISS from squid.mysite.com
Received on Wed Oct 08 2008 - 06:39:04 MDT