The Httpd Web Server, commonly referred to as Apache , is snare server software outstanding for playing a key capacity in the introductory success of the Society Wide Web. In 2009 it became the first cobweb server software to outshine the 100 million website milestone. Apache was the chief viable selection to the Netscape Communications Corporation network server (currently known as Oracle iPlanet Entanglement Server), and has since evolved to challenge other web servers in terms of functionality and performance. Typically Apache is run on a Unix-like operating system.
Apache is developed and maintained by way of an bare community of developers second to the approval of the Apache Software Foundation. The utilization is elbow instead of a broad 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, many implemented as compiled modules which proffer the core functionality. These can choice from server-side programming phrasing stick up for to authentication schemes. Some common lingua franca interfaces support Perl, Python, Tcl, and PHP. Popular authentication modules comprehend mod_access, mod_auth, mod_digest, and mod_auth_epitomize, the successor to mod_digest. A representation of other features comprise SSL and TLS support (mod_ssl), a surrogate module (mod_substitute), a URL rewriter (also known as a rewrite appliance, implemented under mod_rewrite), routine log files (mod_log_config), and filtering sustain (mod_comprehend and mod_ext_screen).
Stock compression methods on Apache take in the external height module, mod_gzip, implemented to improve with reduction of the area (authority) of web pages served over HTTP. ModSecurity is an open begetter intrusion detection and interception machine in the direction of cobweb applications. Apache logs can be analyzed through a web browser using relieved of scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows everyone Apache station to serve uncountable unalike physical websites. On model, one gismo with united Apache installation could simultaneously serve www.example.com, www.test.com, evaluate47.test-server.test.com, etc.
Apache features configurable fluff messages, DBMS-based authentication databases, and constituents negotiation. It is also supported next to disparate graphical user interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing tool and supports FTP.

Display


This fraction does not cite any references or sources. Suit cure enhance this section through adding citations to secure sources. Unsourced fabric may be challenged and removed. (October 2009)
Although the foremost layout aspiration of Apache is not to be the "fastest" trap server, Apache does take playing comparable to other "high-performance" network servers. Instead of implementing a only architecture, Apache provides a breed of MultiProcessing Modules (MPMs) which allow Apache to run in a process-based, half-breed (modify and motif) or event-hybrid mode, to superior meet the demands of each discriminating infrastructure. This implies that the preference of chasten MPM and the nullify configuration is important. Where compromises in performance desperate straits to be made, the design of Apache is to humble latency and increase throughput, dependent on to simply handling more requests, that reason ensuring accordant and trusted processing of requests within logical time-frames.
The Apache version considered by means of the Apache Fundamental as providing high-performance is the multi-threaded style which mixes the put to use of diverse processes and various threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads suffer with a trim overhead than processes), it does not match the performances of the event-based architecture provided via other servers, uncommonly when they procedure events with a variety of hand threads.
This difference can be smoothly explained by the high up that identical thread per interrelationship brings (as opposed to a couple of worker threads per CPU, each processing diverse connection events). Each ease needs to contend its own load, environs, and switching from in unison string to another is also an priceless assignment in search CPUs.