The Apache HTTP Server, commonly referred to as Apache , is snare server software outstanding seeking playing a level capacity in the incipient broadening of the Set Extensive Web. In 2009 it became the first snare server software to surpass the 100 million website milestone. Apache was the beginning rapport different to the Netscape Communications Corporation network server (currently known as Augury iPlanet Snare Server), and has since evolved to compete with other snare servers in terms of functionality and performance. Typically Apache is escape on a Unix-like operating system.
Apache is developed and maintained by an public community of developers underneath the approval of the Apache Software Foundation. The germaneness is available instead of a fully 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 Commission, 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 serve 63% of all websites and 66% of the million busiest.
Features

Apache supports a mixture of features, varied implemented as compiled modules which on the gist functionality. These can range from server-side programming communication assist to authentication schemes. Some inferior words interfaces buttress Perl, Python, Tcl, and PHP. Popular authentication modules comprehend mod_access, mod_auth, mod_pr‚cis, and mod_auth_r‚sum‚, the successor to mod_digest. A representation of other features comprise 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 affirm (mod_include and mod_ext_screen).
Sought-after compression methods on Apache take in the foreign dimensions module, mod_gzip, implemented to help with reduction of the area (strain) of cobweb pages served over HTTP. ModSecurity is an uncommitted source intrusion detection and prevention engine in the direction of cobweb applications. Apache logs can be analyzed through a entanglement browser using sprung scripts such as AWStats/W3Perl or Visitors.
Accepted hosting allows everyone Apache investiture to one's duty innumerable divers actual websites. On pattern, joined gismo with harmonious Apache swearing-in could simultaneously serve www.example.com, www.test.com, check up on47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and capacity negotiation. It is also supported by sundry graphical operator interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search engine and an HTML authorizing tool and supports FTP.

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Although the sheer layout aspiration of Apache is not to be the "fastest" entanglement server, Apache does take dispatch comparable to other "high-performance" trap servers. As contrasted with of implementing a single architecture, Apache provides a heterogeneity of MultiProcessing Modules (MPMs) which concede Apache to hump it in a process-based, combination (process and filament) or event-hybrid way, to better meet the demands of each particular infrastructure. This implies that the preference of correct MPM and the mark configuration is important. Where compromises in doing need to be made, the design of Apache is to slash latency and advance throughput, dependent on to austerely handling more requests, that reason ensuring consistent and honourable processing of requests within tenable time-frames.
The Apache version considered past the Apache Base as providing high-performance is the multi-threaded version which mixes the put to use of several processes and several threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads suffer with a trim outlay than processes), it does not copy the performances of the event-based architecture provided sooner than other servers, unusually when they procedure events with respective workman threads.
This dissimilarity can be beyond explained beside the aloft that undivided filament per interrelationship brings (as opposed to a couple of wage-earner threads per CPU, each processing numberless interplay events). Each thread needs to uphold its own stack, environs, and switching from inseparable theme to another is also an priceless stint for CPUs.