Webserver directory index - Wikipedia
https://en.wikipedia.org/wiki/Index.html
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 default page, which is often referred to as a main or "index" page.. A common filename for such a page is index.html, but most modern HTTP servers offer a configurable list of filenames that the server can ...
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