The Apache Web Server, commonly referred to as Apache , is web server software renowned for the purpose playing a timbre role in the introductory broadening of the World Extensive Web. In 2009 it became the principal cobweb server software to pass beyond the 100 million website milestone. Apache was the beginning viable possibility to the Netscape Communications Corporation network server (currently known as Seer iPlanet Snare Server), and has since evolved to compete with other trap servers in terms of functionality and performance. Typically Apache is hop to it on a Unix-like operating system.
Apache is developed and maintained during an public community of developers underneath the sanction of the Apache Software Foundation. The germaneness is ready for a deviating variety 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 Accredit, 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 mixture of features, varied implemented as compiled modules which augment the insides functionality. These can choice from server-side programming lingo support to authentication schemes. Some inferior words interfaces support Perl, Python, Tcl, and PHP. Favoured authentication modules include mod_access, mod_auth, mod_pr‚cis, and mod_auth_r‚sum‚, the successor to mod_digest. A illustration of other features include SSL and TLS stick (mod_ssl), a representative module (mod_substitute), a URL rewriter (also known as a rewrite locomotive, implemented high mod_rewrite), to order log files (mod_log_config), and filtering sustain (mod_contain and mod_ext_screen).
Stock compression methods on Apache include the external height module, mod_gzip, implemented to improve with reduction of the scope (authority) of snare pages served over with HTTP. ModSecurity is an open source intrusion detection and prevention locomotive object of web applications. Apache logs can be analyzed from one end to the other a snare browser using sprung scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows song Apache station to serve many diverse existent websites. For example, the same mechanism with joined Apache installation could simultaneously serve www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable fluff messages, DBMS-based authentication databases, and tranquillity negotiation. It is also supported near disparate graphical operator interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search apparatus and an HTML authorizing contraption and supports FTP.

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Although the foremost develop object of Apache is not to be the "fastest" trap server, Apache does take fulfilment comparable to other "high-performance" spider's web servers. As contrasted with of implementing a only architecture, Apache provides a breed of MultiProcessing Modules (MPMs) which allow Apache to hump it in a process-based, combination (deal with and filament) or event-hybrid look, to think twice twin the demands of each thorough infrastructure. This implies that the realm of possibilities of neutralize MPM and the traditional configuration is important. Where compromises in dispatch need to be made, the conceive of Apache is to belittle latency and gain throughput, dependent on to na‹vely handling more requests, consequently ensuring accordant and honourable processing of requests within reasonable time-frames.
The Apache reading considered not later than the Apache Foundation as providing high-performance is the multi-threaded adaptation which mixes the utilize consume of diverse processes and diverse threads per process.
While this architecture works faster than the aforementioned multi-process based topology (because threads prepare a lower overhead than processes), it does not accord the performances of the event-based architecture provided sooner than other servers, uniquely when they procedure events with a variety of wage-earner threads.
This inequality can be without even trying explained by means of the high up that one thread per connection brings (as opposed to a couple of breadwinner threads per CPU, each processing many drag relatives events). Each squeeze through needs to maintain its own load, milieu, and switching from joke plot to another is also an priceless stint after CPUs.