Scripting
Query String Auth In Apache
Query-String-Based Apache Authentication
from : http://www.lucidiocy.com/2010/07/query-string-based-apache.html
RewriteEngine on
RewriteCond %{QUERY_STRING} action=secret_admin
RewriteRule ^/app/.*$ - [E=app_auth_required:1]
<directory /root/of/your/app>
Order deny,allow
Deny from env=app_auth_required
AuthType Basic
AuthName "Login Required"
AuthUserFile some_htpasswd_file
require valid_user
Satisfy any
</directory>