Apache HTTP Server C The Apache HTTP Server application 'httpd'. The Apache HTTP Server is an open-source HTTP server for modern operating systems including UNIX, Microsoft Windows, Mac OS/X and Netware. The goal of this project is to provide a secure, efficient and extensible server that provides HTTP services observing the current HTTP standards. Apache has been the most popular web server on the Internet since April of 1996. Recommended current 2.4 release 2021-06-01 2.4.48 Hypertext Transfer Protocol -- HTTP/1.1 IETF RFC 2616 HTTP Authentication: Basic and Digest Access Authentication IETF RFC 2617 HTTP Extensions for Distributed Authoring -- WEBDAV IETF RFC 2518 Versioning Extensions to WebDAV IETF RFC 3253 Uniform Resource Identifier (URI): Generic Syntax IETF RFC 3986