The Apache Web Server, commonly referred to as Apache , is web server software notable seeking playing a level duty in the commencing development of the World Wide Web. In 2009 it became the principal web server software to best the 100 million website milestone. Apache was the beginning viable possibility to the Netscape Communications Corporation trap server (currently known as Message iPlanet Network 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 public community of developers impaired the sanction of the Apache Software Foundation. The application is available representing a deviating 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 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 variety of features, tons implemented as compiled modules which proffer the insides functionality. These can class from server-side programming phrasing authenticate to authentication schemes. Some conventional language interfaces guy Perl, Python, Tcl, and PHP. Favoured authentication modules take in mod_access, mod_auth, mod_survive, and mod_auth_synopsis, the successor to mod_digest. A illustration of other features embrace SSL and TLS help (mod_ssl), a proxy module (mod_representative), a URL rewriter (also known as a rewrite appliance, implemented lower than drunk mod_rewrite), routine 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 servants with reduction of the appraise (authority) of web pages served during the course of HTTP. ModSecurity is an uncover fountain-head intrusion detection and interception engine in the direction of net applications. Apache logs can be analyzed help of a web browser using sprung scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows song Apache installation to serve multitudinous unalike actual websites. Through despite example, the same gizmo with joined Apache installation could simultaneously perform www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable slip-up messages, DBMS-based authentication databases, and capacity negotiation. It is also supported by several graphical drug interfaces (GUIs).
It supports shibboleth 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 main design aspiration of Apache is not to be the "fastest" web server, Apache does take dispatch comparable to other "high-performance" trap servers. In lieu of of implementing a individual architecture, Apache provides a breed of MultiProcessing Modules (MPMs) which deduct Apache to skip out in a process-based, combination (process and filament) or event-hybrid way, to excel blend the demands of each thorough infrastructure. This implies that the select of neutralize MPM and the nullify configuration is important. Where compromises in dispatch need to be made, the lay out of Apache is to reduce latency and gain throughput, appurtenant to to obviously handling more requests, consequently ensuring predictable and secure processing of requests within judicious time-frames.
The Apache translation considered past the Apache Foundation as providing high-performance is the multi-threaded version which mixes the manipulate of very many processes and diverse threads per process.
While this architecture works faster than the too soon multi-process based topology (because threads prepare a trim outlay than processes), it does not compare with the performances of the event-based architecture provided via other servers, especially when they change events with several hand threads.
This dissimilarity can be easily explained on the overhead that a man line per relevance brings (as opposed to a yoke of worker threads per CPU, each processing profuse drag relatives events). Each sequence needs to uphold its own load, habitat, and switching from one theme to another is also an high-priced assignment in compensation CPUs.