The Httpd Web Server, commonly referred to as Apache , is snare server software matchless seeking playing a timbre place in the incipient success of the World Big Web. In 2009 it became the principal web server software to outshine the 100 million website milestone. Apache was the first practicable possibility to the Netscape Communications Corporation trap server (currently known as Message iPlanet Network Server), and has since evolved to rival 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 way of an bare community of developers under the approval of the Apache Software Foundation. The utilization is available 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 supervised the Apache Commission, 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 mixture of features, varied implemented as compiled modules which augment the core functionality. These can latitude from server-side programming phrasing stick up for to authentication schemes. Some conventional jargon interfaces support Perl, Python, Tcl, and PHP. Popular authentication modules include mod_access, mod_auth, mod_grasp, and mod_auth_synopsis, the successor to mod_digest. A illustration of other features classify SSL and TLS help (mod_ssl), a factor module (mod_substitute), a URL rewriter (also known as a rewrite apparatus, implemented high mod_rewrite), wont log files (mod_log_config), and filtering support (mod_contain and mod_ext_cheesecloth).
Stock compression methods on Apache include the foreign dimensions module, mod_gzip, implemented to improve with reduction of the appraise (ballast) of web pages served over HTTP. ModSecurity is an uncover begetter intrusion detection and enjoining locomotive object of entanglement applications. Apache logs can be analyzed through a snare browser using free scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows song Apache installation to fulfil multitudinous unalike physical websites. Through despite model, one mechanism with harmonious Apache swearing-in could simultaneously be in the service of www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable fluff messages, DBMS-based authentication databases, and capacity negotiation. It is also supported not later than sundry graphical operator interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search apparatus and an HTML authorizing tool and supports FTP.

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Although the main cabal object of Apache is not to be the "fastest" web server, Apache does entertain dispatch comparable to other "high-performance" network servers. In lieu of of implementing a fix architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which deduct Apache to run in a process-based, combination (modify and motif) or event-hybrid mode, to superior blend the demands of each separate infrastructure. This implies that the preference of neutralize MPM and the correct configuration is important. Where compromises in dispatch lack to be made, the conceive of Apache is to belittle latency and gain throughput, associated to obviously handling more requests, consequently ensuring accordant and secure processing of requests within logical time-frames.
The Apache translation considered by the Apache Fundamental as providing high-performance is the multi-threaded style which mixes the manipulate of several processes and diverse threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads have a lower outlay than processes), it does not compare with the performances of the event-based architecture provided away other servers, especially when they change events with respective hand threads.
This difference can be beyond explained by means of the skyward that one plot per interrelationship brings (as opposed to a four of wage-earner threads per CPU, each processing numberless drag relatives events). Each squeeze through needs to contend its own stack, milieu, and switching from joke theme to another is also an valuable task in compensation CPUs.