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When an HTTP client (generally a web browser) requests a URL that points at just a directory rather than at a file within a directory the web server will generally serve up some kind of 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 for the server to use as an index if possible. If a server is configured to support server-side scripting, then there will usually be entries in the list to allow dynamic content to be used as the index page (e.g. index.php, index.shtml, default.asp). For example, in the popular open source web server Apache, the list of filenames is controlled by the DirectoryIndex directive in the main server configuration file or in the configuration file for that directory. If the server cannot find a file with any of the names listed in its configuration, it may either return an error (generally 404 Not Found) or generate its own index page listing files in the directory. This is usually also a configurable option. In order to allow relative links to work correctly, the URL for a directory must end with a slash. If it does not then most web servers will send an HTTP redirect to add the slash.
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