What is the best way to implement a password entry to the site directory if you do not need to show the default login form?

Question

htaccess

When you go to the address of the directory, all the folders that are there are displayed. It is necessary that the stub file be displayed, but if you enter a login / password (the form is initially hidden, available either at a different address, or in some other way), the folders will be shown again.
Through htaccess there is authorization, it suits, but the fact that the form is shown immediately does not fit.