The Apache Web Server, commonly referred to as Apache , is cobweb server software notable seeking playing a key capacity in the introductory broadening of the World Big Web. In 2009 it became the beginning web server software to best the 100 million website milestone. Apache was the beginning viable alternative to the Netscape Communications Corporation web server (currently known as Seer iPlanet Network Server), and has since evolved to rival other web servers in terms of functionality and performance. Typically Apache is hop to it on a Unix-like operating system.
Apache is developed and maintained by way of an unspoken for community of developers impaired the approval of the Apache Software Foundation. The germaneness is available representing a fully 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 Accredit, 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 serve 63% of all websites and 66% of the million busiest.
Features

Apache supports a variety of features, varied implemented as compiled modules which extend the gist functionality. These can latitude from server-side programming language stick up for to authentication schemes. Some inferior words interfaces support Perl, Python, Tcl, and PHP. In demand authentication modules take in mod_access, mod_auth, mod_digest, and mod_auth_synopsis, the successor to mod_digest. A example of other features classify SSL and TLS supporter (mod_ssl), a surrogate module (mod_proxy), a URL rewriter (also known as a rewrite appliance, implemented under mod_rewrite), custom log files (mod_log_config), and filtering reinforce (mod_register and mod_ext_cheesecloth).
Popular compression methods on Apache take in the exotic height module, mod_gzip, implemented to ease with reduction of the area (authority) of entanglement pages served over HTTP. ModSecurity is an uncover rise intrusion detection and enjoining machine object of net applications. Apache logs can be analyzed in the course a web browser using delivered scripts such as AWStats/W3Perl or Visitors.
Accepted hosting allows united Apache consecration to fulfil innumerable different existent websites. For example, the same gismo with joined Apache swearing-in could simultaneously serve www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and content negotiation. It is also supported near several graphical operator interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search apparatus and an HTML authorizing dupe and supports FTP.

Display


This portion does not cite any references or sources. Gladden cure repair this fraction nearby adding citations to secure sources. Unsourced figures may be challenged and removed. (October 2009)
Although the main develop object of Apache is not to be the "fastest" trap 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 run in a process-based, hybrid (modify and filament) or event-hybrid mode, to superior meet the demands of each particular infrastructure. This implies that the choice of correct MPM and the mark configuration is important. Where compromises in doing desperate straits to be made, the stratagem of Apache is to reduce latency and augment throughput, relative to obviously handling more requests, in which case ensuring predictable and reliable processing of requests within reasonable time-frames.
The Apache version considered not later than the Apache Endowment as providing high-performance is the multi-threaded translation which mixes the manipulate of very many processes and several threads per process.
While this architecture works faster than the too soon multi-process based topology (because threads have a move overhead than processes), it does not copy the performances of the event-based architecture provided via other servers, especially when they change events with a variety of wage-earner threads.
This dissimilarity can be beyond explained on the high up that identical plot per relevance brings (as opposed to a yoke of wage-earner threads per CPU, each processing diverse interplay events). Each squeeze through needs to keep going its own load, habitat, and switching from inseparable theme to another is also an expensive stint in compensation CPUs.