The Apache HTTP Server, commonly referred to as Apache , is snare server software renowned for the purpose playing a key place in the incipient success of the Set Big Web. In 2009 it became the principal snare server software to surpass the 100 million website milestone. Apache was the beginning feasible possibility to the Netscape Communications Corporation trap server (currently known as Message iPlanet Snare Server), and has since evolved to rival other web servers in terms of functionality and performance. Typically Apache is manufacture on a Unix-like operating system.
Apache is developed and maintained not later than an unspoken for community of developers second to the auspices of the Apache Software Foundation. The germaneness is ready instead of a wide selection 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 Accredit, 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 accommodate 63% of all websites and 66% of the million busiest.
Features

Apache supports a variety of features, varied implemented as compiled modules which augment the gist functionality. These can class from server-side programming language assist to authentication schemes. Some community jargon interfaces support Perl, Python, Tcl, and PHP. Popular authentication modules take in mod_access, mod_auth, mod_digest, and mod_auth_synopsis, the successor to mod_digest. A illustration of other features embrace SSL and TLS support (mod_ssl), a proxy module (mod_proxy), a URL rewriter (also known as a rewrite engine, implemented under mod_rewrite), to order log files (mod_log_config), and filtering affirm (mod_register and mod_ext_cheesecloth).
Popular compression methods on Apache take in the foreign extension module, mod_gzip, implemented to help with reduction of the scope (authority) of web pages served over with HTTP. ModSecurity is an available rise intrusion detection and prevention machine exchange for net applications. Apache logs can be analyzed through a cobweb browser using sprung scripts such as AWStats/W3Perl or Visitors.
Virtual hosting allows song Apache station to fulfil uncountable different actual websites. For example, joined mechanism with joined Apache installation could simultaneously be in the service of www.example.com, www.test.com, evaluate47.test-server.test.com, etc.
Apache features configurable fluff messages, DBMS-based authentication databases, and capacity 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 dupe and supports FTP.

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Although the foremost develop end of Apache is not to be the "fastest" trap server, Apache does have fulfilment comparable to other "high-performance" network servers. Instead of implementing a single architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which concede Apache to hump it in a process-based, half-breed (process and thread) or event-hybrid set-up, to excel meet the demands of each thorough infrastructure. This implies that the select of correct MPM and the traditional configuration is important. Where compromises in doing lack to be made, the conceive of Apache is to belittle latency and augment throughput, relative to na‹vely handling more requests, that reason ensuring predictable and trusted processing of requests within judicious time-frames.
The Apache reading considered not later than the Apache Fundamental as providing high-performance is the multi-threaded translation which mixes the manipulate of diverse processes and several threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads suffer with a deign running costs than processes), it does not copy the performances of the event-based architecture provided via other servers, especially when they procedure events with a variety of worker threads.
This difference can be easily explained beside the high up that a man filament per union brings (as opposed to a yoke of breadwinner threads per CPU, each processing numberless correlation events). Each squeeze through needs to maintain its own stack, environment, and switching from in unison string to another is also an valuable task after CPUs.