When I access mydomain it shows Apache2 default page

Hi, I just found out that, when I try to access http://mydomain.com it shows Apache2 default page. But I can access my domain if I using https://mydomain.com

I’m using ubuntu 18.04

I’ve try to remove httpd, but there’s no httpd installed on my server.
I’ve remove index.hml file in /var/www/html/index.html, but still cannot access my domain.
I’ve make an empty /var/www/html/index.html, but still still cannot access my domain.

Where do I get wrong?

You need to install it over a clean system

Ok. I reinstall it.