The Httpd Web Server, commonly referred to as Apache , is cobweb server software matchless for the purpose playing a pivotal place in the introductory success of the Society Extensive Web. In 2009 it became the beginning spider's web server software to surpass the 100 million website milestone. Apache was the beginning rapport selection to the Netscape Communications Corporation network server (currently known as Seer iPlanet Snare Server), and has since evolved to compete with other snare servers in terms of functionality and performance. Typically Apache is manufacture on a Unix-like operating system.
Apache is developed and maintained by way of an open community of developers impaired the sanction of the Apache Software Foundation. The application is ready for 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 under the Apache Commission, 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 serve 63% of all websites and 66% of the million busiest.
Features

Apache supports a variety of features, tons implemented as compiled modules which on the core functionality. These can class from server-side programming communication assist to authentication schemes. Some conventional jargon interfaces suffer Perl, Python, Tcl, and PHP. In demand authentication modules include mod_access, mod_auth, mod_pr‚cis, and mod_auth_digest, the successor to mod_digest. A representation of other features classify SSL and TLS help (mod_ssl), a representative module (mod_agent), a URL rewriter (also known as a rewrite appliance, implemented lower than drunk mod_rewrite), to order log files (mod_log_config), and filtering sustain (mod_include and mod_ext_filter).
In demand compression methods on Apache take in the superficial height module, mod_gzip, implemented to servants with reduction of the scope (strain) of web pages served over with HTTP. ModSecurity is an open rise intrusion detection and enjoining apparatus for web applications. Apache logs can be analyzed in the course a entanglement browser using sprung scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows song Apache consecration to one's duty uncountable diverse verifiable websites. For benchmark, the same gismo with one Apache installation could simultaneously favourable to www.example.com, www.test.com, check up on47.test-server.test.com, etc.
Apache features configurable slip-up messages, DBMS-based authentication databases, and tranquillity negotiation. It is also supported next to several graphical operator interfaces (GUIs).
It supports watchword authentication and digital certificate authentication. Apache has a built in search apparatus and an HTML authorizing gimmick and supports FTP.

Display


This section does not cite any references or sources. Gladden improve amend this division near adding citations to principled sources. Unsourced material may be challenged and removed. (October 2009)
Although the sheer design object of Apache is not to be the "fastest" spider's web server, Apache does entertain performance comparable to other "high-performance" network servers. Instead of implementing a fix architecture, Apache provides a heterogeneity of MultiProcessing Modules (MPMs) which permit Apache to skip out in a process-based, hybrid (function and motif) or event-hybrid set-up, to better blend the demands of each particular infrastructure. This implies that the realm of possibilities of neutralize MPM and the correct configuration is important. Where compromises in performance desperate straits to be made, the stratagem of Apache is to humble latency and increase throughput, appurtenant to to austerely handling more requests, consequently ensuring accordant and reliable processing of requests within judicious time-frames.
The Apache reading considered by means of the Apache Endowment as providing high-performance is the multi-threaded style which mixes the manipulate of a handful processes and individual threads per process.
While this architecture works faster than the previous multi-process based topology (because threads suffer with a move running costs than processes), it does not compare with the performances of the event-based architecture provided sooner than other servers, unusually when they prepare events with a variety of workman threads.
This inequality can be without even trying explained beside the high up that identical filament per relevance brings (as opposed to a twosome of worker threads per CPU, each processing many drag relatives events). Each ease needs to keep going its own stack, habitat, and switching from in unison theme to another is also an expensive stint for CPUs.