Intro to Apache - ApacheCon Modules: How they work (sort of) The Apache core does the essentials, and provides an API for extensions. All other functionality is implemented in modules, which then talk to the core through this API. Very few things are essential Most things are implemented in modules. CGI. Authentication. SSI. Logging. Pretty much everything interesting.
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ApacheCon : Intro to Apache - Slide #29 of 139