It is possible to method to show the DirectoryIndex file within the URL as default? For instance, when the DirectoryIndex is index.html, after i entered www.someurl.com, it might instantly display www.someurl.com/index.html

I don’t believe that there’s a choice to trigger Apache to get this done instantly.

But when you realize the index document, you could utilize mod_rewrite to redirect such demands:

RewriteEngine on
RewriteRule ^/$ /index.html [L,R=301]