Caudium
Encyclopedia
Caudium is an open source web server
Web server
Web server can refer to either the hardware or the software that helps to deliver content that can be accessed through the Internet....

. It was originally created as a fork of the Roxen Challenger
Roxen (web server)
Roxen is a free software web server produced by Roxen Internet Software, a company based in Linköping, Sweden and named after the nearby lake Roxen. It is released under the GNU General Public License. Roxen originally appeared as Spinner in the mid-1990s and was written in a C-like language called...

 server. The server is written in C
C (programming language)
C is a general-purpose computer programming language developed between 1969 and 1973 by Dennis Ritchie at the Bell Telephone Laboratories for use with the Unix operating system....

 and Pike
Pike programming language
Pike is an interpreted, general-purpose, high-level, cross-platform, dynamic programming language, with a syntax similar to that of C. Unlike many other dynamic languages, Pike is both statically and dynamically typed, and requires explicit type definitions...

, and Pike is also used to create extensions to the server, although Caudium also supports PHP
PHP
PHP is a general-purpose server-side scripting language originally designed for web development to produce dynamic web pages. For this purpose, PHP code is embedded into the HTML source document and interpreted by a web server with a PHP processor module, which generates the web page document...

.

Caudium is very different from the Apache
Apache HTTP Server
The Apache HTTP Server, commonly referred to as Apache , is web server software notable for playing a key role in the initial growth of the World Wide Web. In 2009 it became the first web server software to surpass the 100 million website milestone...

. The configuration process is different, the directory structure is different, and generally the languages used to program server extensions or dynamic pages are different, although both support PHP. According to the Caudium website, Caudium offers a different performance profile than Apache, because it doesn't fork external processes, making it better suited to cope with sudden spikes of traffic.
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