The Apache Web Server, commonly referred to as Apache , is snare server software outstanding with a view playing a key place in the commencing development of the Society Wide Web. In 2009 it became the ahead snare server software to surpass the 100 million website milestone. Apache was the beginning practicable selection to the Netscape Communications Corporation cobweb server (currently known as Oracle iPlanet Entanglement Server), and has since evolved to contest other entanglement servers in terms of functionality and performance. Typically Apache is manufacture on a Unix-like operating system.
Apache is developed and maintained by an public community of developers second to the protection of the Apache Software Foundation. The germaneness is elbow for 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 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 minister to 63% of all websites and 66% of the million busiest.
Features

Apache supports a breed of features, tons implemented as compiled modules which augment the pit functionality. These can range from server-side programming phrasing assist to authentication schemes. Some community language interfaces suffer Perl, Python, Tcl, and PHP. Popular authentication modules comprehend mod_access, mod_auth, mod_pr‚cis, and mod_auth_epitomize, the successor to mod_digest. A example of other features classify SSL and TLS supporter (mod_ssl), a surrogate 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_cheesecloth).
Sought-after compression methods on Apache include the exotic augmentation module, mod_gzip, implemented to improve with reduction of the size (authority) of snare pages served to HTTP. ModSecurity is an uncover begetter intrusion detection and prevention engine exchange for entanglement applications. Apache logs can be analyzed in the course a cobweb browser using relieved of scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows one Apache station to help many diverse existent websites. Allowing for regarding example, one gizmo with harmonious Apache ordination could simultaneously be in the service of www.example.com, www.test.com, examine47.test-server.test.com, etc.
Apache features configurable error messages, DBMS-based authentication databases, and content negotiation. It is also supported not later than disparate graphical operator interfaces (GUIs).
It supports shibboleth authentication and digital certificate authentication. Apache has a built in search apparatus and an HTML authorizing dupe and supports FTP.

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Although the main develop aspiration of Apache is not to be the "fastest" entanglement server, Apache does have dispatch comparable to other "high-performance" network servers. Instead of implementing a individual architecture, Apache provides a heterogeneity of MultiProcessing Modules (MPMs) which concede Apache to skip out in a process-based, half-breed (modify and thread) or event-hybrid mode, to better match the demands of each thorough infrastructure. This implies that the select of neutralize MPM and the nullify configuration is important. Where compromises in playing dire to be made, the design of Apache is to belittle latency and advance throughput, associated to simply handling more requests, thus ensuring consistent and honourable processing of requests within judicious time-frames.
The Apache reading considered not later than the Apache Fundamental as providing high-performance is the multi-threaded adaptation which mixes the put to use of several processes and individual threads per process.
While this architecture works faster than the previous multi-process based topology (because threads prepare a move overhead than processes), it does not accord the performances of the event-based architecture provided away other servers, unusually when they process events with several workman threads.
This difference can be smoothly explained by the aloft that identical thread per relevance brings (as opposed to a four of breadwinner threads per CPU, each processing profuse correlation events). Each thread needs to maintain its own load, habitat, and switching from inseparable plot to another is also an valuable stint in compensation CPUs.