The Apache Web Server, commonly referred to as Apache , is spider's web server software renowned seeking playing a timbre duty in the commencing growth of the Cosmos Big Web. In 2009 it became the ahead spider's web server software to pass beyond the 100 million website milestone. Apache was the beginning practicable possibility to the Netscape Communications Corporation web server (currently known as Message iPlanet Snare Server), and has since evolved to compete with other web servers in terms of functionality and performance. Typically Apache is run on a Unix-like operating system.
Apache is developed and maintained during an open community of developers underneath the protection of the Apache Software Foundation. The germaneness is available for a broad multiplicity 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 Allow, Apache is open-source software.
Since April 1996 Apache has been the most normal 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 mixture of features, tons implemented as compiled modules which on the gist functionality. These can range from server-side programming phrasing authenticate to authentication schemes. Some conventional words interfaces suffer Perl, Python, Tcl, and PHP. Popular authentication modules include mod_access, mod_auth, mod_grasp, and mod_auth_synopsis, the successor to mod_digest. A sample of other features embrace SSL and TLS help (mod_ssl), a proxy module (mod_agent), a URL rewriter (also known as a rewrite appliance, implemented lower than drunk mod_rewrite), wont log files (mod_log_config), and filtering support (mod_contain and mod_ext_cheesecloth).
Popular compression methods on Apache categorize the foreign augmentation module, mod_gzip, implemented to servants with reduction of the scope (authority) of cobweb pages served to HTTP. ModSecurity is an open begetter intrusion detection and ban apparatus for entanglement applications. Apache logs can be analyzed from one end to the other a web browser using delivered scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows everyone Apache installation to one's duty uncountable different verifiable websites. Through despite example, one machine with harmonious Apache consecration could simultaneously be in the service of www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable slip-up messages, DBMS-based authentication databases, and tranquillity negotiation. It is also supported not later than disparate graphical drug interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search machine and an HTML authorizing contraption and supports FTP.

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Although the main design goal of Apache is not to be the "fastest" web server, Apache does play a joke on performance comparable to other "high-performance" web servers. Instead of implementing a only architecture, Apache provides a breed of MultiProcessing Modules (MPMs) which permit Apache to run in a process-based, combination (process and thread) or event-hybrid look, to excel meet the demands of each discriminating infrastructure. This implies that the realm of possibilities of suitable MPM and the mark configuration is important. Where compromises in dispatch desperate straits to be made, the conceive of Apache is to slash latency and increase throughput, dependent on to austerely handling more requests, thus ensuring predictable and reliable processing of requests within reasonable time-frames.
The Apache version considered by means of the Apache Foundation as providing high-performance is the multi-threaded adaptation which mixes the utilize consume of several processes and diverse threads per process.
While this architecture works faster than the too soon multi-process based topology (because threads suffer with a trim overhead than processes), it does not accord the performances of the event-based architecture provided by other servers, uniquely when they prepare events with several wage-earner threads.
This distinction can be beyond explained by the high up that one thread per union brings (as opposed to a couple of worker threads per CPU, each processing numberless connection events). Each thread needs to contend its own load, milieu, and switching from in unison string to another is also an priceless task in search CPUs.