The Httpd Web Server, commonly referred to as Apache , is web server software renowned with a view playing a timbre role in the commencing growth of the Cosmos Wide Web. In 2009 it became the beginning snare server software to outshine the 100 million website milestone. Apache was the beginning viable selection to the Netscape Communications Corporation network server (currently known as Message iPlanet Entanglement Server), and has since evolved to rival other web 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 bare community of developers impaired the auspices of the Apache Software Foundation. The germaneness is available representing a wide variety 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 License, 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 serve 63% of all websites and 66% of the million busiest.
Features

Apache supports a breed of features, varied implemented as compiled modules which proffer the core functionality. These can range from server-side programming communication support to authentication schemes. Some conventional words interfaces guy Perl, Python, Tcl, and PHP. Trendy authentication modules comprehend mod_access, mod_auth, mod_digest, and mod_auth_r‚sum‚, the successor to mod_digest. A representation of other features include SSL and TLS support (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 reinforce (mod_comprehend and mod_ext_screen).
In demand compression methods on Apache allow for the exotic dimensions module, mod_gzip, implemented to improve with reduction of the appraise (ballast) of web pages served to HTTP. ModSecurity is an available source intrusion detection and ban locomotive in the direction of net applications. Apache logs can be analyzed through a web browser using free scripts such as AWStats/W3Perl or Visitors.
Virtual hosting allows everyone Apache installation to fulfil multitudinous unalike actual websites. Through despite pattern, the same gizmo with one Apache swearing-in could simultaneously perform www.example.com, www.test.com, evaluate47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and content negotiation. It is also supported next to sundry graphical drug 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 sheer design end of Apache is not to be the "fastest" trap server, Apache does have playing comparable to other "high-performance" spider's web servers. Instead of implementing a single architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which deduct Apache to run in a process-based, half-breed (process and filament) or event-hybrid look, to superior twin the demands of each thorough infrastructure. This implies that the realm of possibilities of correct MPM and the nullify configuration is important. Where compromises in doing desperate straits to be made, the conceive of Apache is to slash latency and gain throughput, dependent on to simply handling more requests, that reason ensuring predictable and reliable processing of requests within logical time-frames.
The Apache reading considered by the Apache Endowment as providing high-performance is the multi-threaded version which mixes the put to use of very many processes and various threads per process.
While this architecture works faster than the previous multi-process based topology (because threads prepare a move running costs than processes), it does not copy the performances of the event-based architecture provided sooner than other servers, unusually when they change events with a variety of hand threads.
This dissimilarity can be beyond explained on the overhead that a man thread per interrelationship brings (as opposed to a couple of tradesman threads per CPU, each processing diverse connection events). Each squeeze through needs to maintain its own stack, milieu, and switching from joke string to another is also an valuable censure after CPUs.