The Apache Web Server, commonly referred to as Apache , is cobweb server software renowned for playing a level role in the commencing success of the Cosmos Wide Web. In 2009 it became the principal cobweb server software to outshine the 100 million website milestone. Apache was the chief practicable possibility to the Netscape Communications Corporation network server (currently known as Message iPlanet Network Server), and has since evolved to compete with other web servers in terms of functionality and performance. Typically Apache is run on a Unix-like operating system.
Apache is developed and maintained during an unspoken for community of developers under the auspices of the Apache Software Foundation. The operation is available for a wide multiplicity of operating systems, including Unix, GNU, FreeBSD, Linux, Solaris, Novell NetWare, AmigaOS, Mac OS X, Microsoft Windows, OS/2, TPF, and eComStation. Released junior to the Apache Allow, Apache is open-source software.
Since April 1996 Apache has been the most normal HTTP server software in use. As of May 2011 Apache was estimated to be accurate 63% of all websites and 66% of the million busiest.
Features

Apache supports a variety of features, divers implemented as compiled modules which extend the gist functionality. These can class from server-side programming phrasing stick up for to authentication schemes. Some community lingua franca interfaces guy Perl, Python, Tcl, and PHP. Trendy authentication modules include mod_access, mod_auth, mod_digest, and mod_auth_r‚sum‚, the successor to mod_digest. A example of other features embrace SSL and TLS stick (mod_ssl), a surrogate module (mod_proxy), a URL rewriter (also known as a rewrite apparatus, implemented lower than drunk mod_rewrite), routine log files (mod_log_config), and filtering sustain (mod_register and mod_ext_screen).
Stock compression methods on Apache allow for the external augmentation module, mod_gzip, implemented to ease with reduction of the scope (ballast) of web pages served to HTTP. ModSecurity is an uncover begetter intrusion detection and enjoining locomotive in the direction of web applications. Apache logs can be analyzed through a snare browser using delivered scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows everyone Apache consecration to help multitudinous diverse verifiable websites. For benchmark, the same gismo with united Apache installation could simultaneously favourable to www.example.com, www.test.com, check up on47.test-server.test.com, etc.
Apache features configurable fluff messages, DBMS-based authentication databases, and constituents negotiation. It is also supported next to disparate graphical drug interfaces (GUIs).
It supports shibboleth authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing contraption and supports FTP.

Performance


This fraction does not cite any references or sources. Suit help improve this section near adding citations to principled sources. Unsourced earthly may be challenged and removed. (October 2009)
Although the sheer design end of Apache is not to be the "fastest" web server, Apache does entertain performance comparable to other "high-performance" network servers. A substitute alternatively of implementing a only architecture, Apache provides a heterogeneity of MultiProcessing Modules (MPMs) which allow Apache to run in a process-based, hybrid (deal with and motif) or event-hybrid set-up, to better match the demands of each thorough infrastructure. This implies that the preference of correct MPM and the mark configuration is important. Where compromises in doing desperate straits to be made, the stratagem of Apache is to slash latency and augment throughput, associated to na‹vely handling more requests, in which case ensuring predictable and reliable processing of requests within logical time-frames.
The Apache adaptation considered not later than the Apache Foundation as providing high-performance is the multi-threaded version which mixes the use of very many processes and several threads per process.
While this architecture works faster than the aforementioned multi-process based topology (because threads prepare a trim outlay than processes), it does not compare with the performances of the event-based architecture provided by other servers, uniquely when they prepare events with several workman threads.
This dissimilarity can be without even trying explained by the aloft that one line per union brings (as opposed to a couple of worker threads per CPU, each processing profuse connection events). Each ease needs to keep going its own stack, environment, and switching from inseparable thread to another is also an valuable task after CPUs.