Intro to Apache - ApacheCon Version 2.0 Started talking about it in 1996 Filters, MPM, APR, and other very cool goodies. Still a work in progress, but definately solid. We've been running it on Apache.org for 4 years now Third-party module support coming along very nicely, with most important modules either already available, or a better substitute available.
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ApacheCon : Intro to Apache - Slide #16 of 139