The Httpd Web Server, commonly referred to as Apache , is web server software renowned for the purpose playing a key duty in the incipient broadening of the Cosmos Big Web. In 2009 it became the beginning web server software to outshine the 100 million website milestone. Apache was the beginning practicable alternative to the Netscape Communications Corporation trap server (currently known as Seer iPlanet Entanglement Server), and has since evolved to challenge other web servers in terms of functionality and performance. Typically Apache is hop to it on a Unix-like operating system.
Apache is developed and maintained not later than an bare community of developers under the auspices of the Apache Software Foundation. The germaneness is elbow representing a fully 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 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 serve 63% of all websites and 66% of the million busiest.
Features

Apache supports a collection of features, many implemented as compiled modules which extend the insides functionality. These can range from server-side programming phrasing assist to authentication schemes. Some community lingua franca interfaces buttress Perl, Python, Tcl, and PHP. In demand authentication modules classify mod_access, mod_auth, mod_survive, and mod_auth_epitomize, the successor to mod_digest. A sample of other features classify SSL and TLS support (mod_ssl), a surrogate module (mod_substitute), a URL rewriter (also known as a rewrite engine, implemented lower than drunk mod_rewrite), custom log files (mod_log_config), and filtering reinforce (mod_contain and mod_ext_eliminate).
Popular compression methods on Apache include the exotic extension module, mod_gzip, implemented to ease with reduction of the area (weight) of web pages served during the course of HTTP. ModSecurity is an uncover source intrusion detection and prevention engine object of entanglement applications. Apache logs can be analyzed through a cobweb browser using sprung scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows everyone Apache station to serve innumerable unalike verifiable websites. Through despite benchmark, a specific machine with one Apache swearing-in could simultaneously be in the service of www.example.com, www.test.com, examine47.test-server.test.com, etc.
Apache features configurable fluff messages, DBMS-based authentication databases, and content negotiation. It is also supported near several graphical user interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search apparatus and an HTML authorizing gimmick and supports FTP.

Display


This fraction does not cite any references or sources. Content cure enhance this division by adding citations to reliable sources. Unsourced figures may be challenged and removed. (October 2009)
Although the main layout aspiration of Apache is not to be the "fastest" trap server, Apache does play a joke on playing comparable to other "high-performance" web servers. In lieu of of implementing a individual architecture, Apache provides a heterogeneity of MultiProcessing Modules (MPMs) which concede Apache to leg it in a process-based, half-breed (deal with and motif) or event-hybrid look, to superior blend the demands of each separate infrastructure. This implies that the choice of correct MPM and the correct configuration is important. Where compromises in dispatch dire to be made, the conceive of Apache is to slash latency and gain throughput, associated to na‹vely handling more requests, thus ensuring in concordance and honourable processing of requests within logical time-frames.
The Apache adaptation considered by means of the Apache Base as providing high-performance is the multi-threaded version which mixes the utilize consume of very many processes and diverse threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads prepare a move running costs than processes), it does not accord the performances of the event-based architecture provided away other servers, unusually when they procedure events with a variety of wage-earner threads.
This dissimilarity can be easily explained on the high up that identical filament per union brings (as opposed to a twosome of breadwinner threads per CPU, each processing many drag relatives events). Each ease needs to maintain its own stack, environs, and switching from inseparable theme to another is also an high-priced task after CPUs.