503 instead of 404 -> Caching problem

Hello,

when requesting an URL which does not exist (i.e.
http://www.myzms.at/e1/e2/e999999999
ZMS/Zope sends an 503 (Service Unavailable) Error.
But it should be an 404 (Not Found) Error.

This causes problems with our accelerating cache (Squid). 
When a page moves. I.e. from www.myzms.at/e1/e2/e3 to
www.myzms.at/e1/e20/e3 , ZMS/Zope then delivers an 503 for the old Url
and Squid thinks service is unavailable and will probably come back in
some time. So Squid delivers this cached page on and on. Even if someone
does a "Force Reload" on this page (which shows an Error Page with Code
503 indeed, but does not impress Squid).

So I think a 404 instead of a 503 would solve this, because Squid knows
then, that this place does not exist any more.

Regards
PZ


-- 
"Ordnung ist für einfach denkende Menschen das Ergebnis der ordnenden
Tätigkeit eines ordnenden Wesens.", Hayek