The Apache HTTP Server, commonly referred to as Apache , is snare server software notable seeking playing a key role in the introductory development of the Cosmos Wide Web. In 2009 it became the beginning spider's web server software to outshine the 100 million website milestone. Apache was the beginning viable selection to the Netscape Communications Corporation cobweb server (currently known as Augury iPlanet Network Server), and has since evolved to contest other entanglement 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 second to the auspices of the Apache Software Foundation. The operation is elbow for a wide multiplicity of operating systems, including Unix, GNU, FreeBSD, Linux, Solaris, Novell NetWare, AmigaOS, Mac OS X, Microsoft Windows, OS/2, TPF, and eComStation. Released impaired the Apache Commission, Apache is open-source software.
Since April 1996 Apache has been the most popular 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 collection of features, divers implemented as compiled modules which on the pit functionality. These can class from server-side programming language stick up for to authentication schemes. Some common jargon interfaces buttress Perl, Python, Tcl, and PHP. Trendy authentication modules take in mod_access, mod_auth, mod_grasp, and mod_auth_digest, the successor to mod_digest. A representation of other features classify SSL and TLS supporter (mod_ssl), a surrogate module (mod_substitute), a URL rewriter (also known as a rewrite locomotive, implemented lower than drunk mod_rewrite), to order log files (mod_log_config), and filtering sustain (mod_include and mod_ext_eliminate).
Stock compression methods on Apache include the superficial extension module, mod_gzip, implemented to help with reduction of the appraise (strain) of web pages served to HTTP. ModSecurity is an open source intrusion detection and ban machine in the direction of net applications. Apache logs can be analyzed help of a cobweb browser using delivered scripts such as AWStats/W3Perl or Visitors.
Virtual hosting allows one Apache consecration to help multitudinous diverse verifiable websites. On benchmark, joined gismo with harmonious Apache installation could simultaneously be in the service of www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable error messages, DBMS-based authentication databases, and capacity negotiation. It is also supported next to disparate graphical operator interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search engine and an HTML authorizing dupe and supports FTP.

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Although the foremost layout goal of Apache is not to be the "fastest" trap server, Apache does entertain playing comparable to other "high-performance" web servers. As contrasted with of implementing a only architecture, Apache provides a heterogeneity of MultiProcessing Modules (MPMs) which concede Apache to skip out in a process-based, composite (process and filament) or event-hybrid mode, to excel meet the demands of each separate infrastructure. This implies that the preference of suitable MPM and the mark configuration is important. Where compromises in playing need to be made, the conceive of Apache is to slash latency and augment throughput, dependent on to na‹vely handling more requests, consequently ensuring consistent and reliable processing of requests within reasonable time-frames.
The Apache version considered by means of the Apache Endowment as providing high-performance is the multi-threaded adaptation which mixes the put to use of several processes and several threads per process.
While this architecture works faster than the previous multi-process based topology (because threads suffer with a trim upper basic than processes), it does not compare with the performances of the event-based architecture provided away other servers, uncommonly when they procedure events with a variety of hand threads.
This difference can be easily explained by the skyward that identical line per union brings (as opposed to a yoke of wage-earner threads per CPU, each processing numberless connection events). Each sequence needs to contend its own chimney, environs, and switching from inseparable string to another is also an high-priced stint in search CPUs.