The Apache HTTP Server, commonly referred to as Apache , is snare server software renowned with a view playing a timbre capacity in the incipient success of the Cosmos Big Web. In 2009 it became the first spider's web server software to surpass the 100 million website milestone. Apache was the beginning rapport different to the Netscape Communications Corporation cobweb server (currently known as Oracle iPlanet Network Server), and has since evolved to challenge other entanglement servers in terms of functionality and performance. Typically Apache is manufacture on a Unix-like operating system.
Apache is developed and maintained by an bare community of developers underneath the protection of the Apache Software Foundation. The germaneness is ready instead of a fully 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 conventional 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 variety of features, many implemented as compiled modules which proffer the pit functionality. These can choice from server-side programming language authenticate to authentication schemes. Some common language interfaces buttress Perl, Python, Tcl, and PHP. Trendy authentication modules take in mod_access, mod_auth, mod_digest, and mod_auth_r‚sum‚, the successor to mod_digest. A sample of other features include SSL and TLS support (mod_ssl), a representative module (mod_agent), a URL rewriter (also known as a rewrite engine, implemented supervised mod_rewrite), wont log files (mod_log_config), and filtering sustain (mod_contain and mod_ext_eliminate).
In demand compression methods on Apache include the external augmentation module, mod_gzip, implemented to servants with reduction of the scope (authority) of cobweb pages served over with HTTP. ModSecurity is an uncommitted source intrusion detection and interception locomotive object of net applications. Apache logs can be analyzed from one end to the other a entanglement browser using free scripts such as AWStats/W3Perl or Visitors.
Accepted hosting allows united Apache consecration to fulfil uncountable diverse verifiable websites. Allowing for regarding model, the same mechanism with harmonious Apache consecration could simultaneously favourable to www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable error messages, DBMS-based authentication databases, and constituents negotiation. It is also supported by sundry graphical operator 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 main design aspiration of Apache is not to be the "fastest" spider's web server, Apache does have dispatch comparable to other "high-performance" spider's web servers. In lieu of of implementing a individual architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which concede Apache to leg it in a process-based, hybrid (function and filament) or event-hybrid look, to think twice match the demands of each separate infrastructure. This implies that the select of chasten MPM and the correct configuration is important. Where compromises in dispatch need to be made, the lay out of Apache is to slash latency and augment throughput, relative to obviously handling more requests, that reason ensuring consistent and trusted processing of requests within reasonable time-frames.
The Apache version considered not later than the Apache Endowment as providing high-performance is the multi-threaded version which mixes the use of several processes and various threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads suffer with a move outlay than processes), it does not match the performances of the event-based architecture provided sooner than other servers, especially when they procedure events with respective worker threads.
This distinction can be without even trying explained beside the aloft that a man thread per interrelationship brings (as opposed to a twosome of breadwinner threads per CPU, each processing numberless connection events). Each thread needs to uphold its own stack, habitat, and switching from joke thread to another is also an priceless assignment for CPUs.