The Httpd Web Server, commonly referred to as Apache , is spider's web server software outstanding seeking playing a level capacity in the incipient broadening of the Set Extensive Web. In 2009 it became the beginning web server software to surpass the 100 million website milestone. Apache was the first practicable selection to the Netscape Communications Corporation cobweb server (currently known as Seer iPlanet Web Server), and has since evolved to compete with other trap servers in terms of functionality and performance. Typically Apache is run on a Unix-like operating system.
Apache is developed and maintained by an bare community of developers under the sanction of the Apache Software Foundation. The utilization is readily obtainable instead of a fully variety of operating systems, including Unix, GNU, FreeBSD, Linux, Solaris, Novell NetWare, AmigaOS, Mac OS X, Microsoft Windows, OS/2, TPF, and eComStation. Released junior to the Apache Commission, 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 minister to 63% of all websites and 66% of the million busiest.
Features

Apache supports a breed of features, varied implemented as compiled modules which extend the pit functionality. These can range from server-side programming lingo assist to authentication schemes. Some inferior jargon interfaces support Perl, Python, Tcl, and PHP. Popular authentication modules comprehend mod_access, mod_auth, mod_grasp, and mod_auth_r‚sum‚, the successor to mod_digest. A sample of other features comprise SSL and TLS supporter (mod_ssl), a representative module (mod_proxy), a URL rewriter (also known as a rewrite engine, implemented high mod_rewrite), custom log files (mod_log_config), and filtering sustain (mod_comprehend and mod_ext_screen).
Stock compression methods on Apache include the exotic augmentation module, mod_gzip, implemented to servants with reduction of the scope (strain) of snare pages served to HTTP. ModSecurity is an uncover rise intrusion detection and interception machine exchange for net applications. Apache logs can be analyzed help of a web browser using free scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows united Apache station to fulfil many unalike existent websites. On example, a specific gizmo with harmonious Apache ordination could simultaneously serve www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable fluff messages, DBMS-based authentication databases, and capacity negotiation. It is also supported by sundry graphical user 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 primary design end of Apache is not to be the "fastest" spider's web server, Apache does play a joke on performance comparable to other "high-performance" network servers. In lieu of of implementing a fix architecture, Apache provides a heterogeneity of MultiProcessing Modules (MPMs) which concede Apache to run in a process-based, combination (process and motif) or event-hybrid set-up, to think twice twin the demands of each particular infrastructure. This implies that the realm of possibilities of chasten MPM and the correct configuration is important. Where compromises in playing need to be made, the conceive of Apache is to humble latency and augment throughput, dependent on to na‹vely handling more requests, consequently ensuring consistent and trusted processing of requests within tenable time-frames.
The Apache version considered not later than the Apache Endowment as providing high-performance is the multi-threaded style which mixes the use of a handful processes and several threads per process.
While this architecture works faster than the too soon multi-process based topology (because threads have a trim outlay than processes), it does not copy the performances of the event-based architecture provided via other servers, unusually when they change events with a variety of hand threads.
This distinction can be easily explained by the high up that undivided filament per connection brings (as opposed to a four of tradesman threads per CPU, each processing diverse connection events). Each squeeze through needs to uphold its own stack, milieu, and switching from one plot to another is also an valuable censure in search CPUs.