The Apache HTTP Server, commonly referred to as Apache , is cobweb server software renowned for the purpose playing a level duty in the incipient success of the Set Extensive Web. In 2009 it became the first cobweb server software to pass beyond the 100 million website milestone. Apache was the beginning rapport selection to the Netscape Communications Corporation cobweb server (currently known as Augury iPlanet Snare Server), and has since evolved to contest other snare servers in terms of functionality and performance. Typically Apache is run on a Unix-like operating system.
Apache is developed and maintained during an open community of developers underneath the auspices of the Apache Software Foundation. The utilization is ready representing 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 under the Apache Allow, 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 serve 63% of all websites and 66% of the million busiest.
Features

Apache supports a collection of features, tons implemented as compiled modules which extend the pit functionality. These can latitude from server-side programming lingo authenticate to authentication schemes. Some community words interfaces suffer Perl, Python, Tcl, and PHP. Popular authentication modules take in mod_access, mod_auth, mod_survive, and mod_auth_synopsis, the successor to mod_digest. A illustration of other features comprise SSL and TLS support (mod_ssl), a surrogate module (mod_proxy), a URL rewriter (also known as a rewrite apparatus, implemented lower than drunk mod_rewrite), routine log files (mod_log_config), and filtering affirm (mod_register and mod_ext_eliminate).
In demand compression methods on Apache categorize the exotic height module, mod_gzip, implemented to help with reduction of the scope (ballast) of snare pages served over HTTP. ModSecurity is an uncommitted source intrusion detection and prevention apparatus object of net applications. Apache logs can be analyzed help of a entanglement browser using relieved of scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows united Apache installation to serve multitudinous different actual websites. On benchmark, joined machine with one Apache swearing-in could simultaneously be in the service of www.example.com, www.test.com, evaluate47.test-server.test.com, etc.
Apache features configurable slip-up messages, DBMS-based authentication databases, and content negotiation. It is also supported by several graphical operator interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing dupe and supports FTP.

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Although the main layout end of Apache is not to be the "fastest" entanglement server, Apache does entertain playing comparable to other "high-performance" network servers. A substitute alternatively of implementing a fix architecture, Apache provides a heterogeneity of MultiProcessing Modules (MPMs) which concede Apache to leg it in a process-based, composite (modify and thread) or event-hybrid way, to excel twin the demands of each thorough infrastructure. This implies that the preference of neutralize MPM and the correct configuration is important. Where compromises in playing desperate straits to be made, the stratagem of Apache is to belittle latency and gain throughput, relative to na‹vely handling more requests, consequently ensuring accordant and trusted processing of requests within tenable time-frames.
The Apache reading considered past the Apache Foundation as providing high-performance is the multi-threaded style which mixes the manipulate of very many processes and several threads per process.
While this architecture works faster than the aforementioned multi-process based topology (because threads prepare a trim running costs than processes), it does not match the performances of the event-based architecture provided sooner than other servers, unusually when they prepare events with several hand threads.
This difference can be smoothly explained on the high up that identical line per relevance brings (as opposed to a couple of worker threads per CPU, each processing diverse interplay events). Each sequence needs to uphold its own stack, environment, and switching from joke string to another is also an priceless censure after CPUs.