The Httpd Web Server, commonly referred to as Apache , is cobweb server software outstanding for playing a timbre capacity in the commencing development of the Cosmos Wide Web. In 2009 it became the principal spider's web server software to pass beyond the 100 million website milestone. Apache was the first rapport possibility to the Netscape Communications Corporation trap server (currently known as Message iPlanet Network Server), and has since evolved to rival other snare servers in terms of functionality and performance. Typically Apache is escape on a Unix-like operating system.
Apache is developed and maintained during an unspoken for community of developers under the auspices of the Apache Software Foundation. The application is readily obtainable instead of 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 Accredit, Apache is open-source software.
Since April 1996 Apache has been the most fashionable 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 collection of features, many implemented as compiled modules which extend the core functionality. These can range from server-side programming language assist to authentication schemes. Some conventional jargon interfaces support Perl, Python, Tcl, and PHP. In demand authentication modules include mod_access, mod_auth, mod_grasp, and mod_auth_synopsis, the successor to mod_digest. A example of other features comprise SSL and TLS supporter (mod_ssl), a surrogate module (mod_substitute), a URL rewriter (also known as a rewrite locomotive, implemented lower than drunk mod_rewrite), routine log files (mod_log_config), and filtering affirm (mod_include and mod_ext_cheesecloth).
Sought-after compression methods on Apache take in the foreign extension module, mod_gzip, implemented to ease with reduction of the appraise (ballast) of cobweb pages served over with HTTP. ModSecurity is an open begetter intrusion detection and interception locomotive exchange for cobweb applications. Apache logs can be analyzed from one end to the other a web browser using free scripts such as AWStats/W3Perl or Visitors.
Virtual hosting allows united Apache investiture to fulfil uncountable unalike physical websites. Through despite model, the same mechanism with harmonious Apache consecration could simultaneously serve 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 near several graphical user interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search apparatus and an HTML authorizing tool and supports FTP.

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Although the primary layout goal of Apache is not to be the "fastest" web server, Apache does have performance comparable to other "high-performance" spider's web servers. Instead of implementing a fix architecture, Apache provides a breed of MultiProcessing Modules (MPMs) which concede Apache to skip out in a process-based, half-breed (deal with and piece of yarn) or event-hybrid look, to excel twin the demands of each discriminating infrastructure. This implies that the select of suitable MPM and the correct configuration is important. Where compromises in performance need to be made, the design of Apache is to slash latency and gain throughput, relative to na‹vely handling more requests, in which case ensuring predictable and honourable processing of requests within reasonable time-frames.
The Apache version considered by the Apache Endowment as providing high-performance is the multi-threaded style which mixes the utilize consume of several processes and diverse threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads have a lower overhead than processes), it does not compare with the performances of the event-based architecture provided away other servers, unusually when they change events with a variety of worker threads.
This inequality can be without even trying explained beside the skyward that one thread per connection brings (as opposed to a twosome of breadwinner threads per CPU, each processing numberless drag relatives events). Each ease needs to keep going its own chimney, habitat, and switching from one theme to another is also an priceless assignment in compensation CPUs.