opensource anti-virus gateway application for HTTP traffic!

Is there any thing like that in the open source community projects? I
know that there are some antivirus applications like clamav designed to
act as SMTP/Email anti-virus gateway. I am looking for some thing like a
'http proxy' that also checks and blocks the effected files passing
through it over http. Some thing like TrendMicro's InterScan Web
Security Suite
(http://www.trendmicro.com/en/products/gateway/iwss/evaluate/overview.ht
m).
  
Thanks in advance.

Regards,

-Nabil.



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