The Apache Web Server, commonly referred to as Apache , is web server software notable for playing a pivotal capacity in the initial success of the Cosmos Extensive Web. In 2009 it became the beginning snare server software to pass beyond the 100 million website milestone. Apache was the first rapport selection to the Netscape Communications Corporation cobweb server (currently known as Seer iPlanet Network Server), and has since evolved to compete with other snare servers in terms of functionality and performance. Typically Apache is escape on a Unix-like operating system.
Apache is developed and maintained by an unspoken for community of developers second to the auspices of the Apache Software Foundation. The germaneness is ready on a wide discrepancy 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 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, varied implemented as compiled modules which augment the pit functionality. These can range from server-side programming lingo support to authentication schemes. Some inferior jargon interfaces guy Perl, Python, Tcl, and PHP. Popular authentication modules take in mod_access, mod_auth, mod_digest, and mod_auth_synopsis, the successor to mod_digest. A illustration of other features comprise SSL and TLS stick (mod_ssl), a factor module (mod_representative), a URL rewriter (also known as a rewrite apparatus, implemented high mod_rewrite), custom log files (mod_log_config), and filtering affirm (mod_include and mod_ext_screen).
Stock compression methods on Apache allow for the external augmentation module, mod_gzip, implemented to ease with reduction of the scope (authority) of web pages served over HTTP. ModSecurity is an available source intrusion detection and enjoining machine for web applications. Apache logs can be analyzed from one end to the other a web browser using relieved of scripts such as AWStats/W3Perl or Visitors.
Essential hosting allows song Apache station to serve many diverse verifiable websites. On example, a specific machine with harmonious Apache installation could simultaneously favourable to www.example.com, www.test.com, test47.test-server.test.com, etc.
Apache features configurable fluff messages, DBMS-based authentication databases, and content negotiation. It is also supported near respective graphical operator interfaces (GUIs).
It supports open sesame authentication and digital certificate authentication. Apache has a built in search machine and an HTML authorizing gimmick and supports FTP.

Engagement


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Although the foremost layout object of Apache is not to be the "fastest" trap server, Apache does entertain fulfilment comparable to other "high-performance" web servers. As contrasted with of implementing a single architecture, Apache provides a heterogeneity of MultiProcessing Modules (MPMs) which permit Apache to leg it in a process-based, half-breed (process and motif) or event-hybrid look, to better meet the demands of each thorough infrastructure. This implies that the select of correct MPM and the mark configuration is important. Where compromises in performance need to be made, the lay out of Apache is to reduce latency and advance throughput, appurtenant to to austerely handling more requests, in which case ensuring predictable and secure processing of requests within tenable time-frames.
The Apache reading considered by means of the Apache Fundamental as providing high-performance is the multi-threaded style which mixes the use of several processes and diverse threads per process.
While this architecture works faster than the erstwhile multi-process based topology (because threads set up a trim running costs than processes), it does not match the performances of the event-based architecture provided via other servers, uniquely when they prepare events with several hand threads.
This inequality can be smoothly explained by means of the aloft that one thread per union brings (as opposed to a four of worker threads per CPU, each processing diverse correlation events). Each ease needs to uphold its own load, milieu, and switching from inseparable string to another is also an valuable assignment in search CPUs.