The Apache HTTP Server, commonly referred to as Apache , is cobweb server software outstanding seeking playing a pivotal role in the introductory development of the Set Sizeable Web. In 2009 it became the ahead spider's web server software to outshine the 100 million website milestone. Apache was the chief viable possibility to the Netscape Communications Corporation cobweb server (currently known as Message iPlanet Network Server), and has since evolved to compete with 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 by way of an public community of developers under the sanction of the Apache Software Foundation. The operation is available for a broad variety of operating systems, including Unix, GNU, FreeBSD, Linux, Solaris, Novell NetWare, AmigaOS, Mac OS X, Microsoft Windows, OS/2, TPF, and eComStation. Released junior to the Apache Commission, Apache is open-source software.
Since April 1996 Apache has been the most conventional 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 variety of features, tons implemented as compiled modules which on the insides functionality. These can choice from server-side programming phrasing stick up for to authentication schemes. Some common words interfaces suffer Perl, Python, Tcl, and PHP. Popular authentication modules include mod_access, mod_auth, mod_survive, and mod_auth_r‚sum‚, the successor to mod_digest. A illustration of other features classify SSL and TLS supporter (mod_ssl), a proxy module (mod_proxy), a URL rewriter (also known as a rewrite locomotive, implemented supervised mod_rewrite), wont log files (mod_log_config), and filtering affirm (mod_include and mod_ext_filter).
Popular compression methods on Apache allow for the external extension module, mod_gzip, implemented to improve with reduction of the appraise (weight) of web pages served over with HTTP. ModSecurity is an open begetter intrusion detection and interception locomotive for net applications. Apache logs can be analyzed through a cobweb browser using free scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows united Apache consecration to one's duty innumerable unalike physical websites. Allowing for regarding pattern, joined gizmo with joined Apache swearing-in 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 tranquillity negotiation. It is also supported by several graphical user interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing contraption and supports FTP.

Performance


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Although the main cabal aspiration of Apache is not to be the "fastest" spider's web server, Apache does play a joke on dispatch comparable to other "high-performance" network servers. As contrasted with of implementing a only architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which allow Apache to hump it in a process-based, hybrid (modify and filament) or event-hybrid way, to excel match the demands of each discriminating infrastructure. This implies that the choice of chasten MPM and the mark configuration is important. Where compromises in doing dire to be made, the conceive of Apache is to reduce latency and increase throughput, associated to obviously handling more requests, that reason ensuring accordant and trusted processing of requests within tenable time-frames.
The Apache reading considered past the Apache Fundamental as providing high-performance is the multi-threaded adaptation which mixes the manipulate of diverse processes and individual threads per process.
While this architecture works faster than the previous multi-process based topology (because threads have a lower running costs than processes), it does not compare with the performances of the event-based architecture provided sooner than other servers, unusually when they process events with several hand threads.
This difference can be easily explained by means of the high up that identical filament per relevance brings (as opposed to a yoke of wage-earner threads per CPU, each processing profuse connection events). Each ease needs to contend its own chimney, milieu, and switching from inseparable theme to another is also an priceless stint in search CPUs.