The Apache HTTP Server, commonly referred to as Apache , is cobweb server software notable for playing a key capacity in the introductory success of the Society Big Web. In 2009 it became the first cobweb server software to outshine the 100 million website milestone. Apache was the first viable possibility to the Netscape Communications Corporation cobweb server (currently known as Seer iPlanet Entanglement Server), and has since evolved to compete with other snare 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 underneath the approval of the Apache Software Foundation. The operation is readily obtainable representing a deviating discrepancy of operating systems, including Unix, GNU, FreeBSD, Linux, Solaris, Novell NetWare, AmigaOS, Mac OS X, Microsoft Windows, OS/2, TPF, and eComStation. Released under 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 accommodate 63% of all websites and 66% of the million busiest.
Features

Apache supports a mixture of features, many implemented as compiled modules which proffer the core functionality. These can choice from server-side programming language support to authentication schemes. Some common lingua franca interfaces support Perl, Python, Tcl, and PHP. Trendy authentication modules comprehend mod_access, mod_auth, mod_pr‚cis, and mod_auth_synopsis, the successor to mod_digest. A representation of other features include SSL and TLS supporter (mod_ssl), a surrogate module (mod_proxy), a URL rewriter (also known as a rewrite engine, implemented supervised mod_rewrite), routine log files (mod_log_config), and filtering sustain (mod_comprehend and mod_ext_filter).
In demand compression methods on Apache include the foreign augmentation module, mod_gzip, implemented to servants with reduction of the scope (weight) of web pages served over with HTTP. ModSecurity is an uncover source intrusion detection and interception machine exchange for entanglement applications. Apache logs can be analyzed in the course a cobweb browser using sprung scripts such as AWStats/W3Perl or Visitors.
Accepted hosting allows united Apache station to one's duty many divers actual websites. For example, the same gismo with united Apache swearing-in could simultaneously favourable to www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and constituents negotiation. It is also supported by respective graphical operator interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing contraption and supports FTP.

Performance


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Although the foremost cabal object of Apache is not to be the "fastest" spider's web server, Apache does have performance comparable to other "high-performance" spider's web servers. A substitute alternatively of implementing a individual architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which deduct Apache to skip out in a process-based, hybrid (function and motif) or event-hybrid mode, to better twin the demands of each discriminating infrastructure. This implies that the select of suitable MPM and the correct configuration is important. Where compromises in doing desperate straits to be made, the conceive of Apache is to reduce latency and augment throughput, appurtenant to to simply handling more requests, in which case ensuring predictable and reliable processing of requests within judicious time-frames.
The Apache reading considered not later than the Apache Base as providing high-performance is the multi-threaded style which mixes the manipulate of a handful processes and several threads per process.
While this architecture works faster than the too soon multi-process based topology (because threads prepare a lower overhead than processes), it does not match the performances of the event-based architecture provided by other servers, uniquely when they process events with a handful worker threads.
This dissimilarity can be beyond explained beside the overhead that identical thread per connection brings (as opposed to a twosome of breadwinner threads per CPU, each processing profuse connection events). Each ease needs to maintain its own clamp, habitat, and switching from in unison string to another is also an priceless assignment in search CPUs.