Apache became the most popular Web server in part because of the rich availability of third-party extensions for the server, and because its open architecture made it quite easy to roll your own extensions. Of course, nothing is ever just easy enough, so in developing Apache 2.0, one of the main goals was to improve the Apache API to make it even easier to develop extensions.

This article at IBM's developerWorks website goes through the set up, gives a demonstration of a simple output filter, and illustrates the new API by example. In developing Apache 2.0, one of the main goals was to improve the Apache API to make it even easier to develop extensions. One key change was to specialize a very common selection of typical extension modules, and make developing this specialized subset even easier. (Sniplets of code included)

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