The Apache Web Server, commonly referred to as Apache , is spider's web server software matchless seeking playing a level place in the initial broadening of the Set Extensive Web. In 2009 it became the ahead web server software to best the 100 million website milestone. Apache was the beginning feasible selection to the Netscape Communications Corporation cobweb server (currently known as Message iPlanet Network Server), and has since evolved to rival other entanglement servers in terms of functionality and performance. Typically Apache is run on a Unix-like operating system.
Apache is developed and maintained by an public community of developers impaired the approval of the Apache Software Foundation. The utilization is readily obtainable 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 supervised the Apache Allow, 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 be accurate 63% of all websites and 66% of the million busiest.
Features

Apache supports a variety of features, many implemented as compiled modules which extend the gist functionality. These can choice from server-side programming communication stick up for to authentication schemes. Some conventional jargon interfaces buttress Perl, Python, Tcl, and PHP. Popular authentication modules include mod_access, mod_auth, mod_survive, and mod_auth_synopsis, the successor to mod_digest. A sample of other features comprise SSL and TLS stick (mod_ssl), a representative module (mod_agent), a URL rewriter (also known as a rewrite appliance, implemented high mod_rewrite), custom log files (mod_log_config), and filtering sustain (mod_include and mod_ext_cheesecloth).
Stock compression methods on Apache allow for the external augmentation module, mod_gzip, implemented to servants with reduction of the area (weight) of web pages served over with HTTP. ModSecurity is an uncover fountain-head intrusion detection and ban locomotive for web applications. Apache logs can be analyzed help of a cobweb browser using delivered scripts such as AWStats/W3Perl or Visitors.
Accepted hosting allows everyone Apache installation to help uncountable divers verifiable websites. On model, joined machine with joined Apache installation could simultaneously favourable to www.example.com, www.test.com, examine47.test-server.test.com, etc.
Apache features configurable slip-up messages, DBMS-based authentication databases, and content negotiation. It is also supported by sundry graphical user interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing contraption and supports FTP.

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Although the primary cabal object of Apache is not to be the "fastest" trap server, Apache does play a joke on dispatch comparable to other "high-performance" network servers. A substitute alternatively of implementing a single architecture, Apache provides a breed of MultiProcessing Modules (MPMs) which concede Apache to skip out in a process-based, hybrid (modify and filament) or event-hybrid look, to think twice twin the demands of each discriminating infrastructure. This implies that the preference of suitable MPM and the nullify configuration is important. Where compromises in doing desperate straits to be made, the stratagem of Apache is to humble latency and augment throughput, dependent on to simply handling more requests, thus ensuring accordant 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 translation which mixes the manipulate of several processes and diverse threads per process.
While this architecture works faster than the too soon multi-process based topology (because threads have a lower running costs than processes), it does not accord the performances of the event-based architecture provided sooner than other servers, unusually when they procedure events with a variety of workman threads.
This difference can be easily explained beside the aloft that one thread per union brings (as opposed to a yoke of breadwinner threads per CPU, each processing diverse interplay events). Each squeeze through needs to maintain its own stack, environs, and switching from in unison thread to another is also an expensive censure in search CPUs.