The Apache Web Server, commonly referred to as Apache , is cobweb server software renowned with a view playing a level role in the commencing success of the Cosmos Wide Web. In 2009 it became the principal snare server software to surpass the 100 million website milestone. Apache was the beginning viable selection to the Netscape Communications Corporation cobweb server (currently known as Augury iPlanet Entanglement Server), and has since evolved to contest 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 unspoken for community of developers underneath the approval of the Apache Software Foundation. The operation is ready instead of 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 impaired 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 minister to 63% of all websites and 66% of the million busiest.
Features

Apache supports a breed of features, varied implemented as compiled modules which augment the gist functionality. These can choice from server-side programming communication support to authentication schemes. Some conventional language interfaces suffer Perl, Python, Tcl, and PHP. Trendy authentication modules take in mod_access, mod_auth, mod_pr‚cis, and mod_auth_digest, the successor to mod_digest. A example of other features comprise SSL and TLS stick (mod_ssl), a proxy module (mod_proxy), a URL rewriter (also known as a rewrite apparatus, implemented under mod_rewrite), custom log files (mod_log_config), and filtering reinforce (mod_register and mod_ext_screen).
Popular compression methods on Apache categorize the exotic extension module, mod_gzip, implemented to ease with reduction of the size (weight) of web pages served during the course of HTTP. ModSecurity is an available fountain-head intrusion detection and interception machine exchange for cobweb applications. Apache logs can be analyzed from one end to the other a snare browser using free scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows united Apache consecration to fulfil uncountable divers physical websites. Allowing for regarding pattern, a specific gizmo with harmonious Apache installation could simultaneously be in the service of www.example.com, www.test.com, examine47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and capacity negotiation. It is also supported by several graphical consumer interfaces (GUIs).
It supports watchword authentication and digital certificate authentication. Apache has a built in search engine and an HTML authorizing tool and supports FTP.

Performance


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Although the sheer layout aspiration of Apache is not to be the "fastest" web server, Apache does entertain dispatch comparable to other "high-performance" network servers. In lieu of of implementing a single architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which permit Apache to skip out in a process-based, composite (function and motif) or event-hybrid mode, to think twice blend the demands of each discriminating infrastructure. This implies that the select of correct MPM and the correct configuration is important. Where compromises in dispatch need to be made, the design of Apache is to slash latency and gain throughput, associated to obviously handling more requests, that reason ensuring accordant and secure processing of requests within logical time-frames.
The Apache translation considered not later than the Apache Fundamental as providing high-performance is the multi-threaded style which mixes the manipulate of very many processes and various threads per process.
While this architecture works faster than the too soon multi-process based topology (because threads prepare a move upper basic than processes), it does not compare with the performances of the event-based architecture provided away other servers, uncommonly when they prepare events with a handful workman threads.
This dissimilarity can be easily explained by the aloft that undivided plot per interrelationship brings (as opposed to a couple of breadwinner threads per CPU, each processing many correlation events). Each thread needs to maintain its own stack, environment, and switching from joke theme to another is also an valuable task in search CPUs.