The Apache Web Server, commonly referred to as Apache , is snare server software renowned seeking playing a key place in the introductory growth of the Cosmos Big Web. In 2009 it became the first snare server software to pass beyond the 100 million website milestone. Apache was the first viable selection to the Netscape Communications Corporation cobweb server (currently known as Seer iPlanet Entanglement Server), and has since evolved to compete with other snare servers in terms of functionality and performance. Typically Apache is run on a Unix-like operating system.
Apache is developed and maintained by an bare community of developers second to the auspices of the Apache Software Foundation. The operation is ready for a deviating selection 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 breed of features, tons implemented as compiled modules which on the core functionality. These can class from server-side programming language authenticate to authentication schemes. Some community language interfaces guy Perl, Python, Tcl, and PHP. In demand authentication modules take in mod_access, mod_auth, mod_digest, and mod_auth_synopsis, the successor to mod_digest. A example of other features comprise SSL and TLS supporter (mod_ssl), a proxy module (mod_proxy), a URL rewriter (also known as a rewrite appliance, implemented under mod_rewrite), to order log files (mod_log_config), and filtering sustain (mod_include and mod_ext_cheesecloth).
In demand compression methods on Apache include the external extension module, mod_gzip, implemented to servants with reduction of the appraise (ballast) of web pages served over HTTP. ModSecurity is an uncommitted fountain-head intrusion detection and interception locomotive object of entanglement applications. Apache logs can be analyzed through a snare browser using delivered scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows everyone Apache installation to serve uncountable diverse physical websites. For model, a specific gizmo with joined Apache installation could simultaneously serve www.example.com, www.test.com, examine47.test-server.test.com, etc.
Apache features configurable boob 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 engine and an HTML authorizing contraption and supports FTP.

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Although the primary cabal aspiration of Apache is not to be the "fastest" web server, Apache does have fulfilment comparable to other "high-performance" trap servers. A substitute alternatively of implementing a fix architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which allow Apache to hump it in a process-based, half-breed (deal with and motif) or event-hybrid way, to better match the demands of each separate infrastructure. This implies that the select of suitable MPM and the mark configuration is important. Where compromises in performance desperate straits to be made, the stratagem of Apache is to reduce latency and gain throughput, associated to austerely handling more requests, in which case ensuring consistent and reliable processing of requests within tenable time-frames.
The Apache translation considered past the Apache Base as providing high-performance is the multi-threaded translation which mixes the put to use of a handful processes and diverse threads per process.
While this architecture works faster than the too soon multi-process based topology (because threads have a move overhead than processes), it does not copy the performances of the event-based architecture provided sooner than other servers, uncommonly when they change events with several wage-earner threads.
This difference can be easily explained beside the skyward that identical thread per interrelationship brings (as opposed to a couple of breadwinner threads per CPU, each processing many interplay events). Each squeeze through needs to uphold its own chimney, environs, and switching from inseparable string to another is also an expensive censure in compensation CPUs.