The Httpd Web Server, commonly referred to as Apache , is cobweb server software matchless seeking playing a key capacity in the commencing growth of the World Extensive Web. In 2009 it became the principal cobweb server software to outshine the 100 million website milestone. Apache was the beginning rapport different to the Netscape Communications Corporation web server (currently known as Oracle iPlanet Web Server), and has since evolved to rival other web servers in terms of functionality and performance. Typically Apache is escape on a Unix-like operating system.
Apache is developed and maintained by an bare community of developers underneath the protection of the Apache Software Foundation. The operation is elbow on a deviating multiplicity of operating systems, including Unix, GNU, FreeBSD, Linux, Solaris, Novell NetWare, AmigaOS, Mac OS X, Microsoft Windows, OS/2, TPF, and eComStation. Released supervised 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 accommodate 63% of all websites and 66% of the million busiest.
Features

Apache supports a collection of features, varied implemented as compiled modules which on the gist functionality. These can latitude from server-side programming language authenticate to authentication schemes. Some common jargon interfaces support Perl, Python, Tcl, and PHP. Favoured authentication modules comprehend mod_access, mod_auth, mod_digest, and mod_auth_synopsis, the successor to mod_digest. A representation of other features comprise SSL and TLS stick (mod_ssl), a surrogate 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 sustain (mod_include and mod_ext_cheesecloth).
Sought-after compression methods on Apache include the foreign dimensions module, mod_gzip, implemented to servants with reduction of the area (strain) of snare pages served during the course of HTTP. ModSecurity is an uncover rise intrusion detection and prevention engine exchange for net applications. Apache logs can be analyzed from one end to the other a web browser using delivered scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows one Apache station to serve innumerable different actual websites. Allowing for regarding pattern, the same gizmo with harmonious Apache installation could simultaneously favourable to www.example.com, www.test.com, evaluate47.test-server.test.com, etc.
Apache features configurable boob messages, DBMS-based authentication databases, and content negotiation. It is also supported by disparate graphical operator interfaces (GUIs).
It supports password authentication and digital certificate authentication. Apache has a built in search locomotive and an HTML authorizing contraption and supports FTP.

Display


This section does not cite any references or sources. Gladden cure amend this section by adding citations to secure sources. Unsourced material may be challenged and removed. (October 2009)
Although the foremost develop aspiration of Apache is not to be the "fastest" trap server, Apache does take performance comparable to other "high-performance" web servers. As contrasted with of implementing a single architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which allow Apache to run in a process-based, combination (deal with and piece of yarn) or event-hybrid mode, to better twin the demands of each particular infrastructure. This implies that the preference of chasten MPM and the traditional configuration is important. Where compromises in playing lack to be made, the design of Apache is to humble latency and augment throughput, relative to austerely handling more requests, thus ensuring consistent and reliable processing of requests within reasonable time-frames.
The Apache reading considered by the Apache Base as providing high-performance is the multi-threaded adaptation which mixes the use of diverse processes and several threads per process.
While this architecture works faster than the previous multi-process based topology (because threads set up a lower running costs than processes), it does not copy the performances of the event-based architecture provided by other servers, unusually when they prepare events with several workman threads.
This inequality can be without even trying explained beside the aloft that undivided line per connection brings (as opposed to a yoke of worker threads per CPU, each processing numberless connection events). Each thread needs to uphold its own load, habitat, and switching from inseparable string to another is also an expensive task in compensation CPUs.