Apache and Nginx, by default, allow directory listing unless explicitly disabled. Many amateur webmasters overlook the Options -Indexes directive in their .htaccess files.
In the early days of the internet—and even today on poorly configured servers—web servers default to displaying a directory listing when there is no index.html file in a folder. If you drop a bunch of files into a folder on your server and forget to put up a webpage, the server will simply generate a clean, text-based list of those files: their names, sizes, and modification dates. intitle index of jab tak hai jaan