The Apache Web Server, commonly referred to as Apache , is cobweb server software matchless for playing a level role in the incipient growth of the Society Extensive Web. In 2009 it became the ahead snare server software to best the 100 million website milestone. Apache was the beginning viable alternative to the Netscape Communications Corporation web server (currently known as Message iPlanet Web Server), and has since evolved to compete with other snare servers in terms of functionality and performance. Typically Apache is run on a Unix-like operating system.
Apache is developed and maintained by way of an public community of developers under the protection 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 License, 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 minister to 63% of all websites and 66% of the million busiest.
Features

Apache supports a mixture of features, varied implemented as compiled modules which augment the gist functionality. These can choice from server-side programming lingo stick up for to authentication schemes. Some community language interfaces guy Perl, Python, Tcl, and PHP. In demand authentication modules take in mod_access, mod_auth, mod_survive, and mod_auth_digest, the successor to mod_digest. A representation of other features comprise SSL and TLS stick (mod_ssl), a surrogate module (mod_representative), a URL rewriter (also known as a rewrite appliance, implemented supervised mod_rewrite), wont log files (mod_log_config), and filtering reinforce (mod_include and mod_ext_cheesecloth).
Sought-after compression methods on Apache categorize the exotic height module, mod_gzip, implemented to ease with reduction of the scope (authority) of cobweb pages served over HTTP. ModSecurity is an uncommitted source intrusion detection and ban locomotive in the direction of cobweb applications. Apache logs can be analyzed help of a snare browser using delivered scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows united Apache consecration to help uncountable unalike actual websites. Through despite example, joined gizmo with one Apache ordination could simultaneously perform www.example.com, www.test.com, evaluate47.test-server.test.com, etc.
Apache features configurable fluff messages, DBMS-based authentication databases, and constituents negotiation. It is also supported by disparate graphical drug interfaces (GUIs).
It supports shibboleth authentication and digital certificate authentication. Apache has a built in search engine and an HTML authorizing tool and supports FTP.

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Although the sheer develop goal of Apache is not to be the "fastest" trap server, Apache does entertain fulfilment comparable to other "high-performance" spider's web servers. Instead of implementing a fix architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which deduct Apache to run in a process-based, composite (function and thread) or event-hybrid look, to better blend the demands of each particular infrastructure. This implies that the realm of possibilities of chasten MPM and the traditional configuration is important. Where compromises in dispatch need to be made, the lay out of Apache is to belittle latency and augment throughput, appurtenant to to simply handling more requests, consequently ensuring consistent and secure processing of requests within tenable time-frames.
The Apache reading considered by means of the Apache Fundamental as providing high-performance is the multi-threaded version which mixes the use of a handful processes and individual threads per process.
While this architecture works faster than the aforementioned multi-process based topology (because threads set up a deign overhead than processes), it does not compare with the performances of the event-based architecture provided via other servers, uncommonly when they procedure events with several workman threads.
This inequality can be beyond explained on the aloft that a man thread per connection brings (as opposed to a four of breadwinner threads per CPU, each processing diverse connection events). Each squeeze through needs to contend its own clamp, milieu, and switching from one thread to another is also an expensive censure for CPUs.