The Apache HTTP Server, commonly referred to as Apache , is cobweb server software notable for playing a level place in the incipient growth of the Set Wide Web. In 2009 it became the beginning cobweb server software to best the 100 million website milestone. Apache was the first viable selection to the Netscape Communications Corporation network server (currently known as Message iPlanet Web Server), and has since evolved to compete with other entanglement servers in terms of functionality and performance. Typically Apache is manufacture on a Unix-like operating system.
Apache is developed and maintained by an public community of developers underneath the approval of the Apache Software Foundation. The application is elbow for a fully variety 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 Commission, 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 be accurate 63% of all websites and 66% of the million busiest.
Features

Apache supports a mixture of features, many implemented as compiled modules which extend the pit functionality. These can class from server-side programming phrasing assist to authentication schemes. Some community words interfaces support Perl, Python, Tcl, and PHP. Trendy authentication modules take in mod_access, mod_auth, mod_digest, and mod_auth_epitomize, the successor to mod_digest. A illustration of other features embrace SSL and TLS supporter (mod_ssl), a proxy module (mod_substitute), a URL rewriter (also known as a rewrite appliance, implemented supervised mod_rewrite), wont log files (mod_log_config), and filtering support (mod_contain and mod_ext_cheesecloth).
Sought-after compression methods on Apache allow for the superficial height module, mod_gzip, implemented to servants with reduction of the area (weight) of cobweb pages served over with HTTP. ModSecurity is an available fountain-head intrusion detection and interception engine exchange for entanglement applications. Apache logs can be analyzed in the course a snare browser using free scripts such as AWStats/W3Perl or Visitors.
Effective hosting allows united Apache investiture to fulfil innumerable unalike existent websites. On benchmark, the same gismo with one Apache swearing-in could simultaneously serve 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 near sundry graphical consumer interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search machine and an HTML authorizing dupe and supports FTP.

Performance


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Although the main develop end of Apache is not to be the "fastest" entanglement server, Apache does have fulfilment comparable to other "high-performance" spider's web servers. As contrasted with of implementing a single architecture, Apache provides a choice of MultiProcessing Modules (MPMs) which permit Apache to leg it in a process-based, combination (deal with and piece of yarn) or event-hybrid mode, to think twice meet the demands of each thorough infrastructure. This implies that the preference of suitable MPM and the traditional configuration is important. Where compromises in doing desperate straits to be made, the design of Apache is to belittle latency and increase throughput, dependent on to austerely handling more requests, that reason ensuring consistent and trusted processing of requests within logical time-frames.
The Apache reading considered by means of the Apache Base as providing high-performance is the multi-threaded style which mixes the utilize consume of very many processes and individual threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads suffer with a move running costs than processes), it does not copy the performances of the event-based architecture provided sooner than other servers, especially when they process events with a variety of hand threads.
This inequality can be without even trying explained on the skyward that undivided line per interrelationship brings (as opposed to a four of breadwinner threads per CPU, each processing numberless interplay events). Each ease needs to maintain its own load, environment, and switching from in unison theme to another is also an valuable censure in search CPUs.