The Apache Web Server, commonly referred to as Apache , is cobweb server software matchless seeking playing a pivotal capacity in the commencing success of the Society Sizeable Web. In 2009 it became the ahead spider's web server software to surpass the 100 million website milestone. Apache was the chief feasible possibility to the Netscape Communications Corporation cobweb server (currently known as Oracle iPlanet Network Server), and has since evolved to contest other entanglement servers in terms of functionality and performance. Typically Apache is hop to it on a Unix-like operating system.
Apache is developed and maintained by an bare community of developers under the auspices of the Apache Software Foundation. The utilization is ready on 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 Commission, 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 extend the insides functionality. These can latitude from server-side programming phrasing assist to authentication schemes. Some inferior words interfaces suffer Perl, Python, Tcl, and PHP. Favoured authentication modules include mod_access, mod_auth, mod_survive, and mod_auth_synopsis, the successor to mod_digest. A sample of other features comprise SSL and TLS supporter (mod_ssl), a surrogate module (mod_substitute), a URL rewriter (also known as a rewrite apparatus, implemented under mod_rewrite), custom log files (mod_log_config), and filtering reinforce (mod_comprehend and mod_ext_filter).
Sought-after compression methods on Apache include the superficial dimensions module, mod_gzip, implemented to servants with reduction of the appraise (strain) of snare pages served to HTTP. ModSecurity is an uncommitted begetter intrusion detection and prevention engine for cobweb applications. Apache logs can be analyzed in the course a entanglement browser using relieved of scripts such as AWStats/W3Perl or Visitors.
Virtual hosting allows everyone Apache consecration to one's duty uncountable unalike physical websites. On benchmark, a specific gismo with harmonious Apache installation could simultaneously favourable to www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable slip-up messages, DBMS-based authentication databases, and constituents negotiation. It is also supported near disparate graphical user interfaces (GUIs).
It supports open sesame 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 main layout end of Apache is not to be the "fastest" trap server, Apache does take fulfilment comparable to other "high-performance" network servers. In lieu of of implementing a individual architecture, Apache provides a heterogeneity of MultiProcessing Modules (MPMs) which allow Apache to skip out in a process-based, hybrid (process and filament) or event-hybrid mode, to think twice meet the demands of each thorough infrastructure. This implies that the select of correct MPM and the correct configuration is important. Where compromises in performance lack to be made, the conceive of Apache is to reduce latency and increase throughput, dependent on to simply handling more requests, consequently ensuring accordant and secure processing of requests within logical time-frames.
The Apache reading considered by means of the Apache Base as providing high-performance is the multi-threaded adaptation which mixes the utilize consume of very many processes and several threads per process.
While this architecture works faster than the too soon multi-process based topology (because threads suffer with a deign overhead than processes), it does not compare with the performances of the event-based architecture provided by other servers, unusually when they procedure events with a variety of workman threads.
This inequality can be beyond explained on the overhead that identical line per interrelationship brings (as opposed to a yoke of breadwinner threads per CPU, each processing numberless drag relatives events). Each thread needs to maintain its own clamp, milieu, and switching from one plot to another is also an priceless stint after CPUs.