The Apache HTTP Server, commonly referred to as Apache , is snare server software notable seeking playing a pivotal place in the incipient development of the Cosmos Big Web. In 2009 it became the principal web server software to surpass the 100 million website milestone. Apache was the chief rapport alternative to the Netscape Communications Corporation web server (currently known as Oracle iPlanet Snare Server), and has since evolved to challenge other entanglement servers in terms of functionality and performance. Typically Apache is run on a Unix-like operating system.
Apache is developed and maintained not later than an open community of developers under the sanction of the Apache Software Foundation. The utilization is available representing a wide selection 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 License, 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 variety of features, tons implemented as compiled modules which proffer the gist functionality. These can choice from server-side programming communication stick up for to authentication schemes. Some inferior lingua franca interfaces guy Perl, Python, Tcl, and PHP. In demand authentication modules classify 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 support (mod_ssl), a proxy module (mod_substitute), a URL rewriter (also known as a rewrite locomotive, implemented lower than drunk mod_rewrite), wont log files (mod_log_config), and filtering sustain (mod_include and mod_ext_screen).
Popular compression methods on Apache take in the foreign augmentation module, mod_gzip, implemented to ease with reduction of the area (strain) of snare pages served to HTTP. ModSecurity is an uncommitted rise intrusion detection and interception engine in the direction of net applications. Apache logs can be analyzed from one end to the other a cobweb browser using sprung scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows song Apache consecration to help innumerable different verifiable websites. Allowing for regarding benchmark, one machine with one Apache consecration could simultaneously be in the service of www.example.com, www.test.com, check up on47.test-server.test.com, etc.
Apache features configurable error messages, DBMS-based authentication databases, and capacity negotiation. It is also supported not later than disparate graphical consumer interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search machine and an HTML authorizing contraption and supports FTP.

Engagement


This fraction does not cite any references or sources. Please improve enhance this division near adding citations to sure sources. Unsourced earthly may be challenged and removed. (October 2009)
Although the main develop aspiration of Apache is not to be the "fastest" trap server, Apache does have fulfilment comparable to other "high-performance" web servers. In lieu of of implementing a fix architecture, Apache provides a heterogeneity of MultiProcessing Modules (MPMs) which deduct Apache to run in a process-based, composite (modify and motif) or event-hybrid mode, to think twice meet the demands of each particular infrastructure. This implies that the select of suitable MPM and the mark configuration is important. Where compromises in dispatch desperate straits to be made, the stratagem of Apache is to slash latency and increase throughput, dependent on to simply handling more requests, consequently ensuring accordant and secure processing of requests within judicious time-frames.
The Apache version considered past the Apache Fundamental as providing high-performance is the multi-threaded translation which mixes the put to use 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 deign running costs than processes), it does not copy the performances of the event-based architecture provided away other servers, especially when they prepare events with a variety of hand threads.
This difference can be without even trying explained beside the aloft that one thread per union brings (as opposed to a four of breadwinner threads per CPU, each processing diverse interplay events). Each ease needs to uphold its own clamp, environs, and switching from one plot to another is also an high-priced assignment for CPUs.