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When an HTTP client (generally a Web browser) requests a URL that points to a directory structure instead of an actual Web page within the directory, the Web server will generally serve a general page, which is often referred to as a main or "index" page.
index.html is the traditional filename for such a page, but most modern HTTP servers offer a configurable list of filenames that the server can use as an index. If a server is configured to support server-side scripting, the list will usually include entries allowing dynamic content to be used as the index page (e.g. index.php, index.shtml, default.asp) even though it may be more appropriate to still specify the html output (index.html.php or index.html.aspx), as this should not be taken for granted. An example is the popular open source web server Apache, where the list of filenames is controlled by the DirectoryIndex directive in the main server configuration file or in the configuration file for that direc