Homestead php中的绝对css路径

I am creating a web app in php and I am using Homestead to test locally.

I have an MVC structure in my project. Here it is:

The file in the right side of the picture exists inside the 'Views' folder.

When I link a css with a relative path, it works: <link href="/css/bootstrap.min.css"

But when I try to link it with an absolute path it doesn't: <link href="http://fab.app/public/css/bootstrap.min.css"

Why? And how can I fix it?