The Apache HTTP Server, commonly referred to as Apache , is cobweb server software renowned for playing a key duty in the commencing success of the World Big Web. In 2009 it became the ahead cobweb server software to best the 100 million website milestone. Apache was the chief feasible different to the Netscape Communications Corporation web 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 by an open community of developers under the protection of the Apache Software Foundation. The operation is available instead of a broad 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 Commission, Apache is open-source software.
Since April 1996 Apache has been the most fashionable HTTP server software in use. As of May 2011 Apache was estimated to minister to 63% of all websites and 66% of the million busiest.
Features

Apache supports a collection of features, many implemented as compiled modules which extend the core functionality. These can range from server-side programming communication authenticate to authentication schemes. Some community jargon interfaces support Perl, Python, Tcl, and PHP. In demand authentication modules classify mod_access, mod_auth, mod_survive, and mod_auth_synopsis, the successor to mod_digest. A example of other features classify SSL and TLS support (mod_ssl), a representative module (mod_representative), a URL rewriter (also known as a rewrite appliance, implemented lower than drunk mod_rewrite), to order log files (mod_log_config), and filtering sustain (mod_contain and mod_ext_eliminate).
Stock compression methods on Apache take in the external dimensions module, mod_gzip, implemented to help with reduction of the area (strain) of snare pages served during the course of HTTP. ModSecurity is an uncover fountain-head intrusion detection and prevention locomotive in the direction of cobweb applications. Apache logs can be analyzed through a entanglement browser using relieved of scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows everyone Apache consecration to serve multitudinous divers verifiable websites. Allowing for regarding pattern, one mechanism with joined Apache consecration could simultaneously serve www.example.com, www.test.com, evaluate47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and tranquillity negotiation. It is also supported next to sundry graphical drug interfaces (GUIs).
It supports shibboleth authentication and digital certificate authentication. Apache has a built in search apparatus and an HTML authorizing dupe and supports FTP.

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Although the sheer cabal object of Apache is not to be the "fastest" web server, Apache does entertain playing comparable to other "high-performance" trap servers. Instead of implementing a individual architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which deduct Apache to run in a process-based, combination (function and piece of yarn) or event-hybrid set-up, to think twice meet the demands of each particular infrastructure. This implies that the choice of suitable MPM and the mark configuration is important. Where compromises in playing dire to be made, the lay out of Apache is to slash latency and gain throughput, associated to na‹vely handling more requests, thus ensuring consistent and trusted processing of requests within tenable time-frames.
The Apache version considered by means of the Apache Foundation as providing high-performance is the multi-threaded version which mixes the manipulate of very many processes and diverse threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads set up a deign running costs than processes), it does not match the performances of the event-based architecture provided by other servers, uniquely when they process events with several wage-earner threads.
This difference can be easily explained by the high up that identical plot per connection brings (as opposed to a twosome of wage-earner threads per CPU, each processing many drag relatives events). Each squeeze through needs to keep going its own stack, environment, and switching from joke theme to another is also an valuable stint in search CPUs.