UserDir public_html
<Directory /home/*/public_html>  DAV On
  AuthPAM_Enabled On
  AuthPAM_FallThrough Off  Authtype Digest  AuthName iTools
  AuthDigestDomain "/"  AllowOverride FileInfo AuthConfig Limit Indexes
  Options MultiViews Indexes SymLinksIfOwnerMatch IncludesNoExec  <LimitExcept GET HEAD POST OPTIONS>
    require valid-user
  </LimitExcept>
</Directory>