Apache HTTP Server
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
Hypertext Transfer Protocol -- HTTP/1.1
IETF
RFC 2616
HTTP Authentication: Basic and Digest Access Authentication
RFC 2617
HTTP Extensions for Distributed Authoring -- WEBDAV
RFC 2518
Versioning Extensions to WebDAV
RFC 3253
Uniform Resource Identifier (URI): Generic Syntax
RFC 3986