[squid-users] Squid not caching images/content from certain websites

Dear Squid Users,

Since this is my first email to this list, let me first say a big HELLO
to everybody! I hope I can be of some use to everyone else in the future.

For now however, I have a bugging issue, driving me crazy...

I have attached a rather long debug output of what's a single image link
request being processed, under effect of

debug_options ALL,3

The URL is a simple picture (or can be assumed it is as per format of
URL - no POST, no ? etc...). Or so it seems to me. Thus, it should be
cached cleanly by Squid. Well, in my case not so.

Actually it's so notorious that even when bruteforcing the config with

acl KEPEK urlpath_regex .
cache allow KEPEK
refresh_pattern . 5259487 100% 9259487 ignore-no-cache ignore-private
override-lastmod override-expire ignore-no-store ignore-must-revalidate
store-stale
offline_mode on

(please note that this is no production config, only for demonstration,
and has been used to generate the attached error.txt)

... squid still refuses to cache this picture.

I noticed the same issue with SOME other websites - simple jpeg or gif,
non cache whatever. Images from www.szerencsejatek.hu are one example...

On MOST sites however, the caching works perfectly and as expected.

I already emptied my barrage of config directives on this problem, like
reload into ims etc etc to no avail and searched what I could on Google...

So. Would you be please so kind as to look at this error log and try to
point me into the right direction?

Thank you Sincerely,

Levente Peres