Squid: always TCP_MISS but cached on browser

[breiko]

Hi all,
I have a problem in squid with a particular website.
I'm trying to cache images but squid doesn't work where the cache of browser works properly.

This is from access.log

1182245871.667    674 squid_ip TCP_MISS/200 45750 GET http://squid_ip/WebImage.aspx?file=ecc16d83-d9f1-4685-96bb-c075fd91f061&x=4&y=20&level=4 - DEFAULT_PARENT/remote_ip image/jpeg

This is from the browser (about:Cache):

key:	http://squid_ip/WebImage.aspx?file=ecc16d83-d9f1-4685-96bb-c075fd91f061&x=4&y=20&level=4

fetch count: 4
last fetched:2007-06-19 10:39:38
last modified:2007-06-19 10:39:24
expires:1970-01-01 01:00:00
Data size:45423
file on disk: /home/carlo/.mozilla/firefox/7vnatso6.default/Cache/EB181604d01
Security:This document does not have any security info associated with it.
Client:HTTP
request-method:GET
response-head:HTTP/1.0 200 OK
Date: Tue, 19 Jun 2007 09:49:11 GMT
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
X-AspNet-Version: 1.1.4322
Cache-Control: private
Content-Type: image/jpeg
Content-Length: 45423
X-Cache: MISS from squid_ip
Via: 1.0 squid_ip:80 (squid/2.6.STABLE13)

Do you have any idea?

Best regards

[breiko]

This is from store.log

1182273300.409 RELEASE -1 FFFFFFFF 16CE8098139FF24EE1337B595B1E8E7C  200 1182273888        -1        -1 image/jpeg 37996/37996 GET http://squid_ip/WebImage.aspx?file=ecc16d83-d9f1-4685-96bb-c075fd91f061&x=5&y=20&level=4

I have always a RELEASE on squid but the browser cache the image so I can't understand why.