The Apache HTTP Server, commonly referred to as Apache , is web server software notable seeking playing a level duty in the introductory broadening of the Cosmos Wide Web. In 2009 it became the first spider's web server software to best the 100 million website milestone. Apache was the chief rapport selection to the Netscape Communications Corporation cobweb server (currently known as Message iPlanet Snare Server), and has since evolved to rival other entanglement servers in terms of functionality and performance. Typically Apache is hop to it on a Unix-like operating system.
Apache is developed and maintained during an bare community of developers under the protection of the Apache Software Foundation. The utilization is elbow representing a wide multiplicity 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 Allow, Apache is open-source software.
Since April 1996 Apache has been the most conventional 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 breed of features, varied implemented as compiled modules which augment the gist functionality. These can class from server-side programming phrasing authenticate to authentication schemes. Some inferior words interfaces support Perl, Python, Tcl, and PHP. Trendy authentication modules classify mod_access, mod_auth, mod_pr‚cis, and mod_auth_epitomize, the successor to mod_digest. A representation of other features embrace SSL and TLS stick (mod_ssl), a representative module (mod_representative), a URL rewriter (also known as a rewrite locomotive, implemented high mod_rewrite), custom log files (mod_log_config), and filtering reinforce (mod_register and mod_ext_cheesecloth).
Popular compression methods on Apache allow for the exotic extension module, mod_gzip, implemented to help with reduction of the scope (weight) of entanglement pages served during the course of HTTP. ModSecurity is an open source intrusion detection and enjoining engine for net applications. Apache logs can be analyzed from one end to the other a cobweb browser using sprung scripts such as AWStats/W3Perl or Visitors.
Accepted hosting allows everyone Apache investiture to one's duty innumerable divers physical websites. On pattern, a specific gismo with one Apache installation could simultaneously serve www.example.com, www.test.com, examine47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and constituents negotiation. It is also supported by respective 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 sheer layout goal of Apache is not to be the "fastest" trap server, Apache does play a joke on performance comparable to other "high-performance" web servers. In lieu of of implementing a single architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which permit Apache to skip out in a process-based, half-breed (process and thread) or event-hybrid mode, to think twice twin the demands of each separate infrastructure. This implies that the choice of correct MPM and the correct configuration is important. Where compromises in performance dire to be made, the conceive of Apache is to belittle latency and augment throughput, appurtenant to to obviously handling more requests, consequently ensuring accordant and honourable processing of requests within reasonable time-frames.
The Apache translation considered past the Apache Foundation as providing high-performance is the multi-threaded adaptation 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 upper basic than processes), it does not match the performances of the event-based architecture provided away other servers, especially when they prepare events with a variety of worker threads.
This inequality can be smoothly explained beside the overhead that one line per relevance brings (as opposed to a four of wage-earner threads per CPU, each processing many drag relatives events). Each sequence needs to uphold its own chimney, habitat, and switching from joke theme to another is also an expensive censure after CPUs.