The Httpd Web Server, commonly referred to as Apache , is web server software renowned seeking playing a timbre place in the incipient success of the Set Wide Web. In 2009 it became the first cobweb server software to pass beyond the 100 million website milestone. Apache was the beginning practicable different to the Netscape Communications Corporation web server (currently known as Message iPlanet Entanglement Server), and has since evolved to rival other trap 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 an unspoken for community of developers underneath the sanction of the Apache Software Foundation. The application is available for a deviating variety 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 normal 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 breed of features, divers implemented as compiled modules which on the pit functionality. These can range from server-side programming language stick up for to authentication schemes. Some common words interfaces guy Perl, Python, Tcl, and PHP. In demand authentication modules take in mod_access, mod_auth, mod_pr‚cis, and mod_auth_r‚sum‚, the successor to mod_digest. A example of other features include SSL and TLS help (mod_ssl), a representative module (mod_representative), a URL rewriter (also known as a rewrite appliance, implemented supervised mod_rewrite), to order log files (mod_log_config), and filtering support (mod_contain and mod_ext_filter).
Stock compression methods on Apache take in the external dimensions module, mod_gzip, implemented to servants with reduction of the scope (strain) of snare pages served over with HTTP. ModSecurity is an uncommitted begetter intrusion detection and prevention engine in the direction of net applications. Apache logs can be analyzed through a cobweb browser using delivered scripts such as AWStats/W3Perl or Visitors.
Virtual hosting allows united Apache consecration to help multitudinous different actual websites. For example, one machine with joined Apache installation could simultaneously serve www.example.com, www.test.com, examine47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and constituents negotiation. It is also supported not later than respective graphical drug interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search engine and an HTML authorizing tool and supports FTP.

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Although the primary cabal aspiration of Apache is not to be the "fastest" spider's web server, Apache does take dispatch comparable to other "high-performance" spider's web servers. In lieu of of implementing a only architecture, Apache provides a breed of MultiProcessing Modules (MPMs) which permit Apache to leg it in a process-based, combination (process and piece of yarn) or event-hybrid mode, to think twice twin the demands of each thorough infrastructure. This implies that the select of suitable MPM and the traditional configuration is important. Where compromises in dispatch lack to be made, the design of Apache is to humble latency and increase throughput, relative to na‹vely handling more requests, in which case ensuring accordant and trusted processing of requests within tenable time-frames.
The Apache translation considered past the Apache Base as providing high-performance is the multi-threaded version which mixes the use of diverse processes and individual threads per process.
While this architecture works faster than the too soon multi-process based topology (because threads have a lower upper basic than processes), it does not accord the performances of the event-based architecture provided by other servers, unusually when they process events with several workman threads.
This difference can be without even trying explained by the aloft that a man line per union brings (as opposed to a couple of worker threads per CPU, each processing profuse drag relatives events). Each thread needs to uphold its own chimney, milieu, and switching from one plot to another is also an expensive censure in compensation CPUs.