Apache HTTP Server

Apache HTTP Server

Original author(s)	Robert McCool
Developer(s)	Apache Software Foundation
Initial release	1995^[1]
Stable release	2.4.4 ^[edit] (February 25, 2013; 17 days ago (2013-02-25)) _[±]
Preview release	n/a (n/a) ' _[±]
Development status	Active
Written in	C^[2]
Operating system	Cross-platform
Available in	English
Type	Web server
License	Apache License 2.0
Website	httpd.apache.org

The Apache HTTP Server, commonly referred to as Apache (/əˈpætʃiː/ ə-PA-chee), is a web server software program notable for playing a key role in the initial growth of the World Wide Web.^[3] In 2009 it became the first web server software to surpass the 100 million website milestone.^[4] Apache was the first viable alternative to the Netscape Communications Corporation web server (currently named Oracle iPlanet Web Server). Typically Apache is run on a Unix-like operating system,^[5] and was developed for use on Linux.

Apache is developed and maintained by an open community of developers under the auspices of the Apache Software Foundation. The application is available for a wide variety of operating systems, including Unix, FreeBSD, Linux, Solaris, Novell NetWare, OS X, Microsoft Windows, OS/2, TPF, and eComStation. Released under the Apache License, Apache is open-source software.

Apache was originally based on NCSA HTTPd code. The NCSA code has since been removed from Apache, due to a rewrite.

Since April 1996 Apache has been the most popular HTTP server software in use. As of December 2012^[update] Apache was estimated to serve 63.7% of all active websites and 58.49% of the top servers across all domains.^[6]^[7]^[8]^[9]^[10]

1 Name
2 Features
3 Performance
4 Licensing
5 Apache HTTP Server Project
6 See also
7 References
8 External links

Name

According to the FAQ in the Apache project website, the name Apache was chosen out of respect to the Native American tribe Apache and its superior skills in warfare and strategy. The website also explains the popular origin of the name, A Patchy Server (since it was a set of software patches),^[11] but claims it is erroneous. However, official documentation used to give this very explanation of the name.^[12]

Features

Apache supports a variety of features, many implemented as compiled modules which extend the core functionality. These can range from server-side programming language support to authentication schemes. Some common language interfaces support Perl, Python, Tcl, and PHP. Popular authentication modules include mod_access, mod_auth, mod_digest, and mod_auth_digest, the successor to mod_digest. A sample of other features include Secure Sockets Layer and Transport Layer Security support (mod_ssl), a proxy module (mod_proxy), a URL rewriter (mod_rewrite), custom log files (mod_log_config), and filtering support (mod_include and mod_ext_filter).

Popular compression methods on Apache include the external extension module, mod_gzip, implemented to help with reduction of the size (weight) of web pages served over HTTP. ModSecurity is an open source intrusion detection and prevention engine for web applications. Apache logs can be analyzed through a web browser using free scripts such as AWStats/W3Perl or Visitors.

Virtual hosting allows one Apache installation to serve many different actual websites. For example, one machine with one Apache installation could simultaneously serve www.example.com, www.example.org, test47.test-server.example.edu, etc.

Apache features configurable error messages, DBMS-based authentication databases, and content negotiation. It is also supported by several graphical user interfaces (GUIs).

It supports password authentication and digital certificate authentication. Apache has a built in search engine and an HTML authorizing tool and supports FTP.

Because the source code is freely available, anyone can adapt the server for specific needs, and there is a large public library of Apache add-ons.^[13]^[14]

The open source software movement has received enormous attention in the last several years. It is often characterized as a fundamentally new way to develop software that poses a serious challenge to the commercial software businesses that dominate most software markets today.^[15]

Performance

Although the main design goal of Apache is not to be the "fastest" web server, Apache does have performance similar to other "high-performance" web servers. Instead of implementing a single architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which allow Apache to run in a process-based, hybrid (process and thread) or event-hybrid mode, to better match the demands of each particular infrastructure. This implies that the choice of correct MPM and the correct configuration is important. Where compromises in performance need to be made, the design of Apache is to reduce latency and increase throughput, relative to simply handling more requests, thus ensuring consistent and reliable processing of requests within reasonable time-frames.

The Apache 2.2 series was considered significantly slower than nginx for delivering static pages, although remaining significantly faster for dynamic pages. To address this issue, the Apache version considered by the Apache Foundation as providing high-performance is the multi-threaded version which mixes the use of several processes and several threads per process.^[16] This architecture, and the way it was implemented in the Apache 2.4 series, provides for performance equivalent or slightly better than event-based webservers.^[17]

Licensing

With the release of Apache 2.0,^[when?] there was a change to the Apache Foundation license. Some Apache users^[who?] did not like the change and continued the use of pre-2.0 Apache versions (typically 1.3.x). The OpenBSD project went to the extent of effectively forking Apache 1.3.x for its purposes.^[18]