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I chose it over Apache for its industrial-strength caching features, to accelerate access to the HTTP services hosted on the server. Also, Zope news announcements at the time (several years ago) made me think that Squid front-ends to Zope would be getting a lot of attention and improvement from Zope Corporation. I wonder what became of the "ESI" initiative? (http://www.zope.com/News/PressReleases/OpenSourceESI) http://mail.zope.org/mailman/listinfo/zope-dev )

If you look at the sources for Squid3 you'll find it. jens