To enable per-user homedirectory authentication:
$ nano /Users/user/Sites.htaccess
AuthUserFile /Users/user/.htpasswd
AuthName "Palun anna parool"
AuthType Basic
require user username
$ htpasswd -c .htpasswd username
$ sudo nano /etc/httpd/httpd.conf
AllowOverride AuthConfig
$ sudo serveradmin stop web; sudo serveradmin start web