The Apache HTTP Server, commonly referred to as Apache , is cobweb server software notable seeking playing a timbre capacity in the initial growth of the Set Sizeable Web. In 2009 it became the beginning web server software to pass beyond the 100 million website milestone. Apache was the beginning viable selection to the Netscape Communications Corporation cobweb server (currently known as Augury iPlanet Network Server), and has since evolved to contest other snare 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 an open community of developers second to the sanction of the Apache Software Foundation. The operation is ready for 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 junior to the Apache Allow, Apache is open-source software.
Since April 1996 Apache has been the most fashionable 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, many implemented as compiled modules which augment the pit functionality. These can class from server-side programming communication assist to authentication schemes. Some conventional jargon interfaces support Perl, Python, Tcl, and PHP. In demand authentication modules take in mod_access, mod_auth, mod_grasp, and mod_auth_epitomize, the successor to mod_digest. A example of other features include SSL and TLS stick (mod_ssl), a surrogate module (mod_proxy), a URL rewriter (also known as a rewrite engine, implemented lower than drunk mod_rewrite), custom log files (mod_log_config), and filtering support (mod_register and mod_ext_filter).
In demand compression methods on Apache allow for the external extension module, mod_gzip, implemented to help with reduction of the area (weight) of cobweb pages served to HTTP. ModSecurity is an uncover rise intrusion detection and interception machine object of web applications. Apache logs can be analyzed in the course a entanglement browser using free scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows united Apache station to help many different actual websites. For benchmark, one gizmo with joined Apache ordination could simultaneously favourable to www.example.com, www.test.com, check up on47.test-server.test.com, etc.
Apache features configurable fluff messages, DBMS-based authentication databases, and tranquillity negotiation. It is also supported not later than disparate graphical user 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.

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Although the foremost design end of Apache is not to be the "fastest" spider's web server, Apache does have performance comparable to other "high-performance" network servers. As contrasted with of implementing a only architecture, Apache provides a variety of MultiProcessing Modules (MPMs) which permit Apache to skip out in a process-based, half-breed (process and thread) or event-hybrid way, to superior meet the demands of each discriminating infrastructure. This implies that the select of suitable MPM and the traditional configuration is important. Where compromises in dispatch need to be made, the design of Apache is to slash latency and advance throughput, associated to austerely handling more requests, consequently ensuring in concordance and secure processing of requests within logical time-frames.
The Apache translation considered not later than the Apache Endowment as providing high-performance is the multi-threaded translation which mixes the manipulate of a handful processes and individual threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads prepare a trim overhead than processes), it does not compare with the performances of the event-based architecture provided via other servers, unusually when they prepare events with a variety of wage-earner threads.
This difference can be beyond explained by the aloft that one plot per union brings (as opposed to a yoke of breadwinner threads per CPU, each processing profuse drag relatives events). Each ease needs to keep going its own clamp, environment, and switching from inseparable string to another is also an expensive task in compensation CPUs.