The most common web server (or HTTP server) software on the Internet. Apache is an open-source application originally created from a series of changes (“patches”) made to a web server written at the National Center for Supercomputing Applications, the same place the Mosaic web browser was created.

Apache is designed as a set of modules, enabling administrators to choose which features they wish to use and making it easy to add features to meet specific needs inlcuding handling protocols other than the web-standard HTTP.

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