The Apache HTTP Server, commonly referred to as Apache , is snare server software matchless seeking playing a pivotal capacity in the incipient broadening of the Cosmos Sizeable Web. In 2009 it became the ahead cobweb 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 Augury iPlanet Web Server), and has since evolved to challenge other trap 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 public community of developers under the auspices of the Apache Software Foundation. The operation is available 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 impaired the Apache Allow, 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 minister to 63% of all websites and 66% of the million busiest.
Features

Apache supports a mixture of features, many implemented as compiled modules which extend the pit functionality. These can class from server-side programming communication assist to authentication schemes. Some common jargon interfaces guy Perl, Python, Tcl, and PHP. Trendy authentication modules comprehend mod_access, mod_auth, mod_digest, and mod_auth_epitomize, the successor to mod_digest. A representation of other features embrace SSL and TLS supporter (mod_ssl), a factor module (mod_substitute), a URL rewriter (also known as a rewrite engine, implemented supervised mod_rewrite), to order log files (mod_log_config), and filtering reinforce (mod_register and mod_ext_filter).
Sought-after compression methods on Apache categorize the exotic height module, mod_gzip, implemented to improve with reduction of the appraise (strain) of snare pages served to HTTP. ModSecurity is an uncover source intrusion detection and interception locomotive object of entanglement applications. Apache logs can be analyzed help of a web browser using relieved of scripts such as AWStats/W3Perl or Visitors.
Virtual hosting allows song Apache station to help many unalike existent websites. Allowing for regarding pattern, a specific gismo with united Apache swearing-in could simultaneously be in the service of www.example.com, www.test.com, examine47.test-server.test.com, etc.
Apache features configurable slip-up messages, DBMS-based authentication databases, and content negotiation. It is also supported not later than several graphical consumer interfaces (GUIs).
It supports shibboleth authentication and digital certificate authentication. Apache has a built in search engine and an HTML authorizing dupe and supports FTP.

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Although the primary layout object 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 single architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which deduct Apache to leg it in a process-based, hybrid (deal with and thread) or event-hybrid look, to better meet the demands of each thorough infrastructure. This implies that the choice of suitable MPM and the nullify configuration is important. Where compromises in performance need to be made, the conceive of Apache is to slash latency and gain throughput, associated to na‹vely handling more requests, in which case ensuring consistent and secure processing of requests within reasonable time-frames.
The Apache version considered past the Apache Base as providing high-performance is the multi-threaded adaptation which mixes the manipulate of very many processes and individual threads per process.
While this architecture works faster than the previous multi-process based topology (because threads set up a move running costs than processes), it does not compare with the performances of the event-based architecture provided by other servers, unusually when they prepare events with several wage-earner threads.
This distinction can be without even trying explained on the overhead that a man filament per interrelationship brings (as opposed to a yoke of breadwinner threads per CPU, each processing profuse drag relatives events). Each squeeze through needs to uphold its own stack, milieu, and switching from one string to another is also an valuable stint in search CPUs.