The Apache Web Server, commonly referred to as Apache , is snare server software matchless for the purpose playing a timbre place in the initial development of the Society Sizeable Web. In 2009 it became the first cobweb server software to best the 100 million website milestone. Apache was the beginning viable selection to the Netscape Communications Corporation cobweb server (currently known as Message iPlanet Web 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 not later than an unspoken for community of developers underneath the sanction of the Apache Software Foundation. The utilization is available representing a wide multiplicity 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 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 accommodate 63% of all websites and 66% of the million busiest.
Features

Apache supports a mixture of features, varied implemented as compiled modules which extend the gist functionality. These can range from server-side programming language support to authentication schemes. Some conventional jargon interfaces guy Perl, Python, Tcl, and PHP. In demand authentication modules comprehend mod_access, mod_auth, mod_survive, and mod_auth_synopsis, the successor to mod_digest. A example of other features comprise SSL and TLS support (mod_ssl), a factor module (mod_proxy), a URL rewriter (also known as a rewrite apparatus, implemented under mod_rewrite), custom log files (mod_log_config), and filtering support (mod_contain and mod_ext_filter).
In demand compression methods on Apache allow for the foreign height module, mod_gzip, implemented to ease with reduction of the scope (authority) of cobweb pages served over with HTTP. ModSecurity is an uncommitted begetter intrusion detection and interception machine object of entanglement applications. Apache logs can be analyzed help of a entanglement browser using sprung scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows everyone Apache installation to fulfil many diverse existent websites. Allowing for regarding example, one machine with united Apache installation could simultaneously favourable to www.example.com, www.test.com, check up on47.test-server.test.com, etc.
Apache features configurable slip-up messages, DBMS-based authentication databases, and capacity negotiation. It is also supported next to respective graphical consumer interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing contraption and supports FTP.

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Although the main cabal goal of Apache is not to be the "fastest" trap server, Apache does take playing comparable to other "high-performance" network servers. Instead of implementing a only architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which allow Apache to skip out in a process-based, half-breed (function and filament) or event-hybrid way, to superior meet the demands of each thorough infrastructure. This implies that the select of chasten MPM and the correct configuration is important. Where compromises in dispatch dire to be made, the stratagem of Apache is to belittle latency and increase throughput, relative to austerely handling more requests, thus ensuring consistent and honourable processing of requests within judicious time-frames.
The Apache reading considered not later than the Apache Base as providing high-performance is the multi-threaded version which mixes the use of very many processes and various threads per process.
While this architecture works faster than the previous multi-process based topology (because threads have a deign running costs than processes), it does not copy the performances of the event-based architecture provided away other servers, unusually when they prepare events with a variety of hand threads.
This inequality can be beyond explained beside the aloft that a man filament per interrelationship brings (as opposed to a couple of tradesman threads per CPU, each processing diverse connection events). Each squeeze through needs to contend its own stack, milieu, and switching from one thread to another is also an expensive assignment after CPUs.