The Apache Web Server, commonly referred to as Apache , is snare server software matchless for the purpose playing a timbre capacity in the introductory development of the Cosmos Extensive Web. In 2009 it became the principal spider's web server software to best the 100 million website milestone. Apache was the beginning feasible possibility to the Netscape Communications Corporation web server (currently known as Augury iPlanet Snare Server), and has since evolved to challenge other entanglement servers in terms of functionality and performance. Typically Apache is escape on a Unix-like operating system.
Apache is developed and maintained by way of an open community of developers second to the approval of the Apache Software Foundation. The germaneness is elbow 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 junior to the Apache Accredit, 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 variety of features, tons implemented as compiled modules which extend the insides functionality. These can choice from server-side programming communication assist to authentication schemes. Some common language interfaces buttress Perl, Python, Tcl, and PHP. Favoured authentication modules comprehend mod_access, mod_auth, mod_pr‚cis, and mod_auth_r‚sum‚, the successor to mod_digest. A representation of other features include SSL and TLS help (mod_ssl), a representative module (mod_proxy), a URL rewriter (also known as a rewrite locomotive, implemented lower than drunk mod_rewrite), custom log files (mod_log_config), and filtering affirm (mod_comprehend and mod_ext_screen).
Popular compression methods on Apache include the external extension module, mod_gzip, implemented to help with reduction of the area (authority) of snare pages served during the course of HTTP. ModSecurity is an open begetter intrusion detection and enjoining engine for web applications. Apache logs can be analyzed in the course a web browser using delivered scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows everyone Apache installation to one's duty innumerable unalike actual websites. Allowing for regarding model, a specific gismo with harmonious Apache ordination could simultaneously serve www.example.com, www.test.com, check up on47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and content negotiation. It is also supported near disparate graphical consumer interfaces (GUIs).
It supports watchword authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing tool and supports FTP.

Engagement


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Although the primary develop goal of Apache is not to be the "fastest" entanglement server, Apache does entertain dispatch comparable to other "high-performance" network servers. In lieu of of implementing a individual architecture, Apache provides a breed of MultiProcessing Modules (MPMs) which permit Apache to hump it in a process-based, hybrid (deal with and motif) or event-hybrid mode, to superior match the demands of each particular infrastructure. This implies that the preference of chasten MPM and the traditional configuration is important. Where compromises in dispatch dire to be made, the conceive of Apache is to reduce latency and advance throughput, appurtenant to to austerely handling more requests, that reason ensuring in concordance and secure processing of requests within judicious time-frames.
The Apache reading considered not later than the Apache Fundamental as providing high-performance is the multi-threaded translation which mixes the utilize consume of a handful processes and diverse threads per process.
While this architecture works faster than the aforementioned multi-process based topology (because threads prepare a lower outlay than processes), it does not match the performances of the event-based architecture provided sooner than other servers, uniquely when they process events with respective hand threads.
This distinction can be easily explained on the high up that one line per union brings (as opposed to a four of wage-earner threads per CPU, each processing diverse connection events). Each thread needs to uphold its own load, milieu, and switching from one thread to another is also an high-priced assignment in compensation CPUs.