The Apache Web Server, commonly referred to as Apache , is cobweb server software outstanding with a view playing a key role in the initial growth of the Set Extensive Web. In 2009 it became the ahead spider's web server software to surpass the 100 million website milestone. Apache was the beginning feasible selection to the Netscape Communications Corporation trap 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 run on a Unix-like operating system.
Apache is developed and maintained by way of an public community of developers impaired the auspices of the Apache Software Foundation. The application is readily obtainable 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 under 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, tons implemented as compiled modules which proffer the core functionality. These can choice from server-side programming communication stick up for to authentication schemes. Some common jargon interfaces guy Perl, Python, Tcl, and PHP. Trendy authentication modules take in mod_access, mod_auth, mod_grasp, and mod_auth_epitomize, the successor to mod_digest. A example of other features embrace SSL and TLS help (mod_ssl), a representative module (mod_representative), a URL rewriter (also known as a rewrite appliance, implemented under mod_rewrite), custom log files (mod_log_config), and filtering affirm (mod_comprehend and mod_ext_filter).
In demand compression methods on Apache include the external extension module, mod_gzip, implemented to help with reduction of the area (strain) of snare pages served during the course of HTTP. ModSecurity is an uncommitted source intrusion detection and interception engine in the direction of cobweb applications. Apache logs can be analyzed through a snare browser using delivered scripts such as AWStats/W3Perl or Visitors.
Accepted hosting allows one Apache installation to fulfil many different existent websites. Allowing for regarding model, the same gizmo with united Apache installation could simultaneously favourable to www.example.com, www.test.com, examine47.test-server.test.com, etc.
Apache features configurable error messages, DBMS-based authentication databases, and capacity negotiation. It is also supported by respective graphical drug interfaces (GUIs).
It supports watchword authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing tool and supports FTP.

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Although the main design aspiration of Apache is not to be the "fastest" web server, Apache does have fulfilment comparable to other "high-performance" web servers. As contrasted with of implementing a fix architecture, Apache provides a breed of MultiProcessing Modules (MPMs) which allow Apache to skip out in a process-based, combination (process and piece of yarn) or event-hybrid set-up, to better blend the demands of each particular infrastructure. This implies that the select of correct MPM and the traditional configuration is important. Where compromises in playing dire to be made, the conceive of Apache is to humble latency and advance throughput, appurtenant to to obviously handling more requests, consequently ensuring predictable and trusted processing of requests within judicious time-frames.
The Apache adaptation considered past the Apache Foundation as providing high-performance is the multi-threaded adaptation which mixes the manipulate of several processes and various threads per process.
While this architecture works faster than the aforementioned multi-process based topology (because threads have a move overhead than processes), it does not accord the performances of the event-based architecture provided via other servers, especially when they procedure events with a handful hand threads.
This dissimilarity can be easily explained by the high up that a man line per interrelationship brings (as opposed to a four of wage-earner threads per CPU, each processing profuse drag relatives events). Each ease needs to maintain its own stack, environment, and switching from joke string to another is also an valuable censure in compensation CPUs.