Apache HTTP Server

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The Apache HTTP Server is a free and open-source cross-platform web server, released under the terms of Apache License 2.0. It is developed and maintained by a community of developers under the auspices of the Apache Software Foundation. The vast majority of Apache HTTP Server instances run on a Linux distribution, but current versions also run on Microsoft Windows, OpenVMS, and a wide variety of Unix-like systems. Past versions also ran on NetWare, OS/2 and other operating systems, including ports to mainframes. Originally based on the NCSA HTTPd server, development of Apache began in early 1995 after work on the NCSA code stalled. Apache played a key role in the initial growth of the World Wide Web, It quickly overtook NCSA HTTPd as the dominant web server software for HTTP. In 2009, it became the first web server software to serve more than 100 million websites. As of March 2025, Netcraft estimated that Apache served 17.83% of the million busiest websites, with the other top four being...

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