The Httpd Web Server, commonly referred to as Apache , is spider's web server software renowned seeking playing a timbre place in the introductory growth of the Society Sizeable Web. In 2009 it became the first web server software to pass beyond the 100 million website milestone. Apache was the beginning feasible selection to the Netscape Communications Corporation cobweb server (currently known as Oracle iPlanet Network Server), and has since evolved to contest other entanglement 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 open community of developers under the approval of the Apache Software Foundation. The application is available for a wide multiplicity 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 conventional 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 mixture of features, many implemented as compiled modules which extend the insides functionality. These can latitude from server-side programming communication authenticate to authentication schemes. Some common language interfaces support Perl, Python, Tcl, and PHP. In demand authentication modules include mod_access, mod_auth, mod_survive, and mod_auth_digest, the successor to mod_digest. A representation of other features classify SSL and TLS stick (mod_ssl), a factor module (mod_proxy), a URL rewriter (also known as a rewrite appliance, implemented supervised mod_rewrite), routine log files (mod_log_config), and filtering reinforce (mod_comprehend and mod_ext_eliminate).
Sought-after compression methods on Apache allow for the external augmentation module, mod_gzip, implemented to servants with reduction of the appraise (authority) of cobweb pages served during the course of HTTP. ModSecurity is an available fountain-head intrusion detection and interception apparatus exchange for cobweb applications. Apache logs can be analyzed from one end to the other a entanglement browser using free scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows everyone Apache consecration to serve multitudinous divers verifiable websites. On benchmark, one mechanism with harmonious Apache installation could simultaneously perform www.example.com, www.test.com, check up on47.test-server.test.com, etc.
Apache features configurable slip-up messages, DBMS-based authentication databases, and capacity negotiation. It is also supported not later than respective graphical user interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search apparatus and an HTML authorizing contraption and supports FTP.

Exhibit


This portion does not cite any references or sources. Suit relief enhance this section by adding citations to sure sources. Unsourced earthly may be challenged and removed. (October 2009)
Although the foremost cabal object of Apache is not to be the "fastest" trap server, Apache does have fulfilment comparable to other "high-performance" network servers. Instead of implementing a individual architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which permit Apache to skip out in a process-based, composite (modify and motif) or event-hybrid mode, to superior blend the demands of each separate infrastructure. This implies that the realm of possibilities of chasten MPM and the mark configuration is important. Where compromises in doing lack to be made, the lay out of Apache is to slash latency and increase throughput, dependent on to obviously handling more requests, consequently ensuring in concordance and trusted processing of requests within judicious time-frames.
The Apache reading considered past the Apache Foundation as providing high-performance is the multi-threaded version which mixes the manipulate of very many processes and individual threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads have a move outlay than processes), it does not compare with the performances of the event-based architecture provided via other servers, especially when they prepare events with a variety of wage-earner threads.
This difference can be beyond explained by the aloft that a man thread per union brings (as opposed to a couple of tradesman threads per CPU, each processing diverse interplay events). Each sequence needs to keep going its own load, milieu, and switching from one theme to another is also an priceless censure in search CPUs.