#.htaccess on /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*) index.php?url=$1 [L,NC,QSA]


#.htaccess on /foo

AuthName "Restricted Area" 
AuthType Basic 
AuthUserFile /foo/.htpasswd
require valid-user
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+) index.php?title=$1 [L,NC,QSA]