You can detect Oracle Application Server Containers Default Page using this tool.
The remote web server uses its default welcome page. Therefore, it's probable that this server is not used at all or is serving content that is meant to be hidden.
The remote web server uses the default Oracle Application Server Containers index page. This page may contain some sensitive data like the server root and installation paths. This could potentially leak useful information about the server installation to a remote, unauthenticated attacker.
Review the files and replace or delete as needed.