The Apache Web Server, commonly referred to as Apache , is web server software matchless for playing a timbre role in the commencing growth of the Society Wide Web. In 2009 it became the ahead snare 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 Seer iPlanet Web Server), and has since evolved to challenge other trap servers in terms of functionality and performance. Typically Apache is manufacture on a Unix-like operating system.
Apache is developed and maintained during an open community of developers second to the approval of the Apache Software Foundation. The application is ready for a wide discrepancy of operating systems, including Unix, GNU, FreeBSD, Linux, Solaris, Novell NetWare, AmigaOS, Mac OS X, Microsoft Windows, OS/2, TPF, and eComStation. Released supervised the Apache Accredit, 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 be accurate 63% of all websites and 66% of the million busiest.
Features

Apache supports a collection of features, divers implemented as compiled modules which augment the pit functionality. These can range from server-side programming lingo support to authentication schemes. Some inferior lingua franca interfaces buttress Perl, Python, Tcl, and PHP. Favoured authentication modules classify mod_access, mod_auth, mod_grasp, and mod_auth_r‚sum‚, the successor to mod_digest. A example of other features include SSL and TLS stick (mod_ssl), a proxy module (mod_substitute), a URL rewriter (also known as a rewrite appliance, implemented lower than drunk mod_rewrite), wont log files (mod_log_config), and filtering sustain (mod_register and mod_ext_cheesecloth).
Popular compression methods on Apache categorize the superficial augmentation module, mod_gzip, implemented to ease with reduction of the size (strain) of snare pages served during the course of HTTP. ModSecurity is an available fountain-head intrusion detection and interception machine object of entanglement applications. Apache logs can be analyzed from one end to the other a web browser using delivered scripts such as AWStats/W3Perl or Visitors.
Virtual hosting allows everyone Apache station to serve innumerable different verifiable websites. On example, one gizmo with one Apache installation could simultaneously favourable to www.example.com, www.test.com, examine47.test-server.test.com, etc.
Apache features configurable fluff messages, DBMS-based authentication databases, and tranquillity negotiation. It is also supported next to disparate graphical drug interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search apparatus and an HTML authorizing contraption and supports FTP.

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Although the sheer develop goal of Apache is not to be the "fastest" web server, Apache does play a joke on performance comparable to other "high-performance" web servers. Instead of implementing a single architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which allow Apache to hump it in a process-based, half-breed (deal with and motif) or event-hybrid set-up, to excel meet the demands of each particular infrastructure. This implies that the preference of neutralize MPM and the mark configuration is important. Where compromises in doing need to be made, the lay out of Apache is to humble latency and advance throughput, associated to austerely handling more requests, that reason ensuring in concordance and secure processing of requests within tenable time-frames.
The Apache translation considered by the Apache Base as providing high-performance is the multi-threaded translation which mixes the utilize consume of a handful processes and several threads per process.
While this architecture works faster than the aforementioned multi-process based topology (because threads set up a trim overhead than processes), it does not accord the performances of the event-based architecture provided via other servers, unusually when they prepare events with respective workman threads.
This distinction can be easily explained by means of the skyward that identical filament per interrelationship brings (as opposed to a four of breadwinner threads per CPU, each processing many interplay events). Each squeeze through needs to maintain its own clamp, environs, and switching from in unison string to another is also an expensive censure in search CPUs.