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Squid3 reverse proxy & Failed to select source strange errors

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Hi Squid users,

We're using squid3 as a reverse proxy on several boxes and he's working
quite well.

Squid configuration is quite simple :
cache_peer X.X.X.X parent 80 0 no-query originserver no-digest
cache_peer Y.Y.Y.Y parent 80 0 no-query originserver no-digest

cache_peer_domain X.X.X.X static.myhost1.com
cache_peer_domain Y.Y.Y.Y static.myhost2.com

So squid deliver static content and ONLY get missing files from backend
with cache_peer.

But sometimes (several times a day), i got some stange errors from
cache.log.
It seems that squid is trying to contact servers that are not in
cache_peer list with domain name that I should not handle any request !.

Exemple :
2009/11/23 08:36:28| Failed to select source for
'http://img43.imageshack.us/img43/416/greysanatomypromotional.jpg'
2009/11/23 08:36:28|   always_direct = 0
2009/11/23 08:36:28|    never_direct = 0
2009/11/23 08:36:28|        timedout = 0
[snip]
2009/11/23 11:02:26| Failed to select source for
'http://pagead2.googlesyndication.com/pagead/show_ads.js'
2009/11/23 11:02:26|   always_direct = 0
2009/11/23 11:02:26|    never_direct = 0
2009/11/23 11:02:26|        timedout = 0

I'm not imageshack or google. :)

Did someone have any idea ?

Best regards.
David.

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