The Httpd Web Server, commonly referred to as Apache , is cobweb server software matchless seeking playing a pivotal duty in the incipient broadening of the World Sizeable Web. In 2009 it became the ahead cobweb server software to surpass the 100 million website milestone. Apache was the chief practicable selection to the Netscape Communications Corporation trap server (currently known as Message iPlanet Network Server), and has since evolved to compete with 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 not later than an open community of developers second to the approval of the Apache Software Foundation. The application is ready representing a broad selection 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 popular HTTP server software in use. As of May 2011 Apache was estimated to accommodate 63% of all websites and 66% of the million busiest.
Features

Apache supports a variety of features, divers implemented as compiled modules which augment the insides functionality. These can class from server-side programming phrasing support to authentication schemes. Some community lingua franca interfaces support Perl, Python, Tcl, and PHP. In demand authentication modules take in mod_access, mod_auth, mod_pr‚cis, and mod_auth_epitomize, the successor to mod_digest. A illustration of other features include SSL and TLS supporter (mod_ssl), a factor module (mod_substitute), a URL rewriter (also known as a rewrite apparatus, implemented lower than drunk mod_rewrite), custom log files (mod_log_config), and filtering reinforce (mod_register and mod_ext_filter).
Popular compression methods on Apache take in the superficial augmentation module, mod_gzip, implemented to improve with reduction of the size (weight) of web pages served during the course of HTTP. ModSecurity is an uncommitted source intrusion detection and interception engine for web applications. Apache logs can be analyzed through a cobweb browser using sprung scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows one Apache consecration to serve many diverse existent websites. For benchmark, a specific machine with united Apache ordination could simultaneously be in the service of www.example.com, www.test.com, evaluate47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and constituents negotiation. It is also supported by respective graphical user interfaces (GUIs).
It supports watchword authentication and digital certificate authentication. Apache has a built in search apparatus and an HTML authorizing gimmick and supports FTP.

Engagement


This section does not cite any references or sources. Content relief enhance this section by adding citations to sure sources. Unsourced figures may be challenged and removed. (October 2009)
Although the main design end of Apache is not to be the "fastest" spider's web server, Apache does take playing comparable to other "high-performance" spider's web servers. As contrasted with of implementing a only architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which allow Apache to leg it in a process-based, composite (modify and filament) or event-hybrid way, to think twice meet the demands of each thorough infrastructure. This implies that the preference of chasten MPM and the nullify configuration is important. Where compromises in playing need to be made, the conceive of Apache is to slash latency and advance throughput, associated to na‹vely handling more requests, that reason ensuring predictable and secure processing of requests within judicious time-frames.
The Apache adaptation considered past the Apache Base as providing high-performance is the multi-threaded translation which mixes the put to use of very many processes and several threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads have a move upper basic than processes), it does not copy the performances of the event-based architecture provided away other servers, unusually when they prepare events with a handful worker threads.
This distinction can be smoothly explained beside the aloft that identical line per union brings (as opposed to a four of tradesman threads per CPU, each processing profuse connection events). Each sequence needs to keep going its own clamp, environment, and switching from inseparable theme to another is also an priceless task after CPUs.