The Apache HTTP Server, commonly referred to as Apache , is web server software renowned for playing a pivotal role in the commencing broadening of the World Wide Web. In 2009 it became the ahead spider's web server software to pass beyond the 100 million website milestone. Apache was the chief rapport possibility to the Netscape Communications Corporation web server (currently known as Oracle iPlanet Network Server), and has since evolved to compete with other snare servers in terms of functionality and performance. Typically Apache is hop to it on a Unix-like operating system.
Apache is developed and maintained during an unspoken for community of developers second to the protection of the Apache Software Foundation. The utilization is available for a deviating 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 Allow, Apache is open-source software.
Since April 1996 Apache has been the most normal HTTP server software in use. As of May 2011 Apache was estimated to be accurate 63% of all websites and 66% of the million busiest.
Features

Apache supports a collection of features, tons implemented as compiled modules which proffer the insides functionality. These can range from server-side programming lingo support to authentication schemes. Some community words interfaces buttress Perl, Python, Tcl, and PHP. Favoured authentication modules classify mod_access, mod_auth, mod_digest, and mod_auth_digest, the successor to mod_digest. A representation of other features embrace SSL and TLS stick (mod_ssl), a surrogate module (mod_agent), a URL rewriter (also known as a rewrite engine, implemented lower than drunk mod_rewrite), to order log files (mod_log_config), and filtering reinforce (mod_register and mod_ext_screen).
Popular compression methods on Apache take in the exotic augmentation module, mod_gzip, implemented to servants with reduction of the size (ballast) of cobweb pages served to HTTP. ModSecurity is an uncommitted begetter intrusion detection and ban engine exchange for web applications. Apache logs can be analyzed help of a web browser using relieved of scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows united Apache consecration to fulfil uncountable unalike verifiable websites. Through despite example, a specific mechanism with one Apache ordination could simultaneously serve 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 content negotiation. It is also supported near respective graphical consumer interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing gimmick and supports FTP.

Display


This fraction does not cite any references or sources. Suit cure amend this leg near adding citations to reliable sources. Unsourced fabric may be challenged and removed. (October 2009)
Although the foremost design goal of Apache is not to be the "fastest" web server, Apache does take performance comparable to other "high-performance" trap servers. As contrasted with of implementing a fix architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which allow Apache to leg it in a process-based, composite (function and filament) or event-hybrid mode, to excel meet the demands of each particular infrastructure. This implies that the realm of possibilities of suitable MPM and the correct configuration is important. Where compromises in dispatch lack to be made, the design of Apache is to reduce latency and increase throughput, appurtenant to to na‹vely handling more requests, in which case ensuring consistent and secure processing of requests within logical time-frames.
The Apache version considered by the Apache Base as providing high-performance is the multi-threaded adaptation which mixes the use of very many processes and several threads per process.
While this architecture works faster than the aforementioned multi-process based topology (because threads set up a move outlay than processes), it does not compare with the performances of the event-based architecture provided sooner than other servers, unusually when they procedure events with respective hand threads.
This difference can be easily explained beside the overhead that one plot per union brings (as opposed to a couple of tradesman threads per CPU, each processing numberless interplay events). Each sequence needs to maintain its own load, environs, and switching from in unison thread to another is also an priceless censure in search CPUs.