The Apache Web Server, commonly referred to as Apache , is cobweb server software matchless for playing a key duty in the commencing development of the Cosmos Big Web. In 2009 it became the beginning spider's web server software to best the 100 million website milestone. Apache was the beginning rapport different to the Netscape Communications Corporation cobweb server (currently known as Seer iPlanet Entanglement Server), and has since evolved to rival other trap servers in terms of functionality and performance. Typically Apache is escape on a Unix-like operating system.
Apache is developed and maintained by way of an open community of developers impaired the approval of the Apache Software Foundation. The application is ready for a wide discrepancy 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 Commission, Apache is open-source software.
Since April 1996 Apache has been the most popular 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, tons implemented as compiled modules which augment the core functionality. These can class from server-side programming phrasing authenticate to authentication schemes. Some community words interfaces guy Perl, Python, Tcl, and PHP. Favoured authentication modules classify mod_access, mod_auth, mod_grasp, and mod_auth_synopsis, the successor to mod_digest. A sample of other features classify SSL and TLS help (mod_ssl), a proxy 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_register and mod_ext_cheesecloth).
Stock compression methods on Apache categorize the external augmentation module, mod_gzip, implemented to servants with reduction of the area (strain) of entanglement pages served during the course of HTTP. ModSecurity is an available begetter intrusion detection and prevention locomotive in the direction of net applications. Apache logs can be analyzed in the course a web browser using relieved of scripts such as AWStats/W3Perl or Visitors.
Accepted hosting allows united Apache installation to serve multitudinous unalike existent websites. On pattern, the same mechanism with joined Apache consecration could simultaneously serve www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable slip-up messages, DBMS-based authentication databases, and content negotiation. It is also supported not later than several graphical user interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search engine and an HTML authorizing gimmick and supports FTP.

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Although the foremost layout object of Apache is not to be the "fastest" trap server, Apache does take dispatch comparable to other "high-performance" trap servers. Instead of implementing a only architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which permit Apache to run in a process-based, combination (deal with and filament) or event-hybrid set-up, to superior match the demands of each thorough infrastructure. This implies that the preference of correct MPM and the mark configuration is important. Where compromises in dispatch desperate straits to be made, the lay out of Apache is to belittle latency and increase throughput, associated to na‹vely handling more requests, consequently ensuring accordant and trusted processing of requests within judicious time-frames.
The Apache version considered by means of the Apache Base as providing high-performance is the multi-threaded style which mixes the put to use of a handful processes and diverse threads per process.
While this architecture works faster than the previous multi-process based topology (because threads prepare a move overhead than processes), it does not accord the performances of the event-based architecture provided sooner than other servers, uncommonly when they process events with a handful hand threads.
This difference can be smoothly explained beside the high up that one filament per interrelationship brings (as opposed to a yoke of tradesman threads per CPU, each processing many correlation events). Each squeeze through needs to contend its own chimney, environs, and switching from inseparable theme to another is also an priceless censure after CPUs.