The Apache HTTP Server, commonly referred to as Apache , is cobweb server software outstanding seeking playing a level role in the introductory success of the Society Big Web. In 2009 it became the beginning snare server software to pass beyond the 100 million website milestone. Apache was the chief practicable possibility to the Netscape Communications Corporation trap server (currently known as Oracle iPlanet Entanglement Server), and has since evolved to compete with other web 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 open community of developers impaired the auspices of the Apache Software Foundation. The germaneness is ready on a broad 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 be accurate 63% of all websites and 66% of the million busiest.
Features

Apache supports a collection of features, tons implemented as compiled modules which extend the gist functionality. These can range from server-side programming language support to authentication schemes. Some conventional language interfaces guy Perl, Python, Tcl, and PHP. Favoured authentication modules comprehend mod_access, mod_auth, mod_pr‚cis, and mod_auth_digest, the successor to mod_digest. A example of other features include SSL and TLS help (mod_ssl), a surrogate module (mod_agent), a URL rewriter (also known as a rewrite appliance, implemented under mod_rewrite), routine log files (mod_log_config), and filtering sustain (mod_comprehend and mod_ext_cheesecloth).
In demand compression methods on Apache include the exotic height module, mod_gzip, implemented to servants with reduction of the size (strain) of cobweb pages served over HTTP. ModSecurity is an available source intrusion detection and ban machine in the direction of web applications. Apache logs can be analyzed in the course a cobweb browser using free scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows song Apache installation to help uncountable unalike physical websites. For example, a specific machine with harmonious Apache installation could simultaneously serve www.example.com, www.test.com, evaluate47.test-server.test.com, etc.
Apache features configurable error messages, DBMS-based authentication databases, and tranquillity negotiation. It is also supported not later than sundry graphical consumer interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search engine and an HTML authorizing dupe and supports FTP.

Display


This fraction does not cite any references or sources. Suit help enhance this division near adding citations to principled sources. Unsourced figures may be challenged and removed. (October 2009)
Although the foremost design end of Apache is not to be the "fastest" trap server, Apache does take performance comparable to other "high-performance" trap servers. As contrasted with of implementing a fix architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which concede Apache to skip out in a process-based, composite (process and thread) or event-hybrid look, to better twin the demands of each particular infrastructure. This implies that the preference of correct MPM and the correct configuration is important. Where compromises in playing need to be made, the lay out of Apache is to humble latency and augment throughput, associated to na‹vely handling more requests, thus ensuring consistent and trusted processing of requests within judicious time-frames.
The Apache reading considered not later than the Apache Fundamental as providing high-performance is the multi-threaded style which mixes the put to use of diverse processes and several threads per process.
While this architecture works faster than the too soon multi-process based topology (because threads suffer with a lower outlay than processes), it does not copy the performances of the event-based architecture provided by other servers, unusually when they procedure events with respective wage-earner threads.
This inequality can be beyond explained by means of the overhead that a man line per union brings (as opposed to a four of wage-earner threads per CPU, each processing diverse connection events). Each squeeze through needs to keep going its own stack, milieu, and switching from in unison thread to another is also an expensive task in search CPUs.