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open etc/apache2/apache2.conf
find security model for the directory in question (e.g. <Directory /var/www/>)
  - delete Indexes from line 'Options'    - to disable file listing in a directory
  - set AllowOverride None/All            - to disable/enable .htaccess files to override default security model
  - set Require ip/host [IP/host]         - to enable http access for certain visitors
    set Require all denied/granted        - to disable/enable http access to that directory
    set Require not [IP|host]             - to disable http access for certain visitors
restart:
  service apache2 restart