The Apache Web Server, commonly referred to as Apache , is snare server software matchless seeking playing a timbre capacity in the incipient growth of the Set Wide Web. In 2009 it became the principal cobweb server software to surpass the 100 million website milestone. Apache was the beginning feasible selection to the Netscape Communications Corporation cobweb server (currently known as Augury iPlanet Entanglement Server), and has since evolved to contest other trap servers in terms of functionality and performance. Typically Apache is run on a Unix-like operating system.
Apache is developed and maintained by way of an open community of developers under the protection of the Apache Software Foundation. The germaneness is ready for a broad discrepancy 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 License, 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 minister to 63% of all websites and 66% of the million busiest.
Features

Apache supports a collection of features, divers implemented as compiled modules which extend the core functionality. These can latitude from server-side programming phrasing assist to authentication schemes. Some conventional jargon interfaces support Perl, Python, Tcl, and PHP. Favoured authentication modules classify mod_access, mod_auth, mod_grasp, and mod_auth_epitomize, the successor to mod_digest. A illustration of other features include SSL and TLS help (mod_ssl), a representative module (mod_proxy), a URL rewriter (also known as a rewrite engine, implemented lower than drunk mod_rewrite), custom log files (mod_log_config), and filtering support (mod_include and mod_ext_screen).
Stock compression methods on Apache allow for the exotic augmentation module, mod_gzip, implemented to improve with reduction of the appraise (ballast) of snare pages served over HTTP. ModSecurity is an open rise intrusion detection and enjoining engine for cobweb applications. Apache logs can be analyzed help of a entanglement browser using relieved of scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows song Apache consecration to one's duty uncountable divers existent websites. For pattern, the same gizmo with harmonious Apache installation could simultaneously serve www.example.com, www.test.com, check up on47.test-server.test.com, etc.
Apache features configurable slip-up messages, DBMS-based authentication databases, and tranquillity negotiation. It is also supported near several graphical drug interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search engine and an HTML authorizing gimmick and supports FTP.

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Although the sheer design end of Apache is not to be the "fastest" entanglement server, Apache does have fulfilment comparable to other "high-performance" network servers. As contrasted with of implementing a single architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which concede Apache to skip out in a process-based, combination (modify and thread) or event-hybrid way, to think twice match the demands of each separate infrastructure. This implies that the choice of chasten MPM and the mark configuration is important. Where compromises in doing dire to be made, the stratagem of Apache is to reduce latency and augment throughput, associated to austerely handling more requests, that reason ensuring accordant and reliable processing of requests within logical time-frames.
The Apache adaptation considered past the Apache Foundation as providing high-performance is the multi-threaded version which mixes the use of a handful processes and various threads per process.
While this architecture works faster than the previous multi-process based topology (because threads prepare a trim overhead than processes), it does not compare with the performances of the event-based architecture provided away other servers, uniquely when they process events with a handful hand threads.
This distinction can be beyond explained on the overhead that one thread per interrelationship brings (as opposed to a couple of worker threads per CPU, each processing profuse connection events). Each ease needs to uphold its own load, environment, and switching from inseparable plot to another is also an valuable assignment in compensation CPUs.