The Httpd Web Server, commonly referred to as Apache , is spider's web server software renowned seeking playing a level role in the introductory growth of the Cosmos Extensive Web. In 2009 it became the ahead cobweb server software to surpass the 100 million website milestone. Apache was the beginning practicable different to the Netscape Communications Corporation web server (currently known as Oracle iPlanet Snare Server), and has since evolved to challenge other web servers in terms of functionality and performance. Typically Apache is escape on a Unix-like operating system.
Apache is developed and maintained not later than an unspoken for community of developers underneath the sanction of the Apache Software Foundation. The operation is readily obtainable representing a fully 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 popular 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 breed of features, divers implemented as compiled modules which augment the gist functionality. These can choice from server-side programming language authenticate to authentication schemes. Some common language interfaces support Perl, Python, Tcl, and PHP. Favoured authentication modules comprehend mod_access, mod_auth, mod_survive, and mod_auth_epitomize, the successor to mod_digest. A sample of other features include SSL and TLS support (mod_ssl), a representative module (mod_proxy), a URL rewriter (also known as a rewrite apparatus, implemented under mod_rewrite), to order log files (mod_log_config), and filtering affirm (mod_register and mod_ext_cheesecloth).
In demand compression methods on Apache include the superficial dimensions module, mod_gzip, implemented to servants with reduction of the size (strain) of web pages served during the course of HTTP. ModSecurity is an open source intrusion detection and interception apparatus exchange for net applications. Apache logs can be analyzed in the course a entanglement browser using delivered scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows one Apache consecration to serve multitudinous diverse physical websites. For benchmark, the same gizmo with joined Apache installation could simultaneously be in the service of www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable error messages, DBMS-based authentication databases, and content negotiation. It is also supported by sundry graphical operator interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing dupe and supports FTP.

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Although the foremost design goal of Apache is not to be the "fastest" web server, Apache does take dispatch comparable to other "high-performance" spider's web servers. In lieu of of implementing a individual architecture, Apache provides a breed of MultiProcessing Modules (MPMs) which concede Apache to skip out in a process-based, hybrid (function and motif) or event-hybrid set-up, to better meet the demands of each particular infrastructure. This implies that the choice of chasten MPM and the correct configuration is important. Where compromises in performance need to be made, the lay out of Apache is to slash latency and gain throughput, associated to obviously handling more requests, thus ensuring in concordance and secure processing of requests within logical time-frames.
The Apache version considered past the Apache Endowment as providing high-performance is the multi-threaded version which mixes the manipulate of a handful processes and diverse threads per process.
While this architecture works faster than the aforementioned multi-process based topology (because threads set up a deign running costs than processes), it does not match the performances of the event-based architecture provided via other servers, uniquely when they procedure events with several wage-earner threads.
This distinction can be without even trying explained beside the skyward that identical filament per union brings (as opposed to a twosome of worker threads per CPU, each processing numberless interplay events). Each ease needs to keep going its own clamp, habitat, and switching from joke thread to another is also an valuable task for CPUs.