I wan a dir just accessable with server ip? I was hide my ip with cloudflare.
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Using apache, creating a .htaccess file like the one below in the directory you want to hide should work.
Options +FollowSymLinks +Indexes -MultiViews
# Turn mod_rewrite on
RewriteEngine On
RewriteBase /files/videos/
# if the request is not for 127.0.0.1 then block it
RewriteCond %{HTTP_HOST} !^127\.0\.0\.1$ [NC]
RewriteRule ^ - [F]
Replace /files/videos with the path to your folder and 127.0.0.1 and 127.0.0.1 with your droplet’s IP address. This should refuse requests from anything using a domain and will only allow requests using the IP address directly.