Tutorial Allow Single URL Through .htaccess Password Protection
This code is useful for multi environment setups (staging, production, etc.) it allows you to keep your htaccess files in sync while maintaining an htpasswd on your development environment or anything but the live environment.
#allows a single uri through the .htaccess password protection
SetEnvIf Request_URI "/testing_uri$" test_uri
#allows everything if its on a certain host
SetEnvIf HOST "^testing.yoursite.com" testing_url
SetEnvIf HOST "^yoursite.com" live_url
Order Deny,Allow
AuthName "Restricted Area"
AuthType Basic
AuthUserFile /path/to/your/.htpasswd
AuthGroupFile /
Require valid-user
#Allow valid-user
Deny from all
Allow from env=test_uri
Allow from env=testing_url
Allow from env=live_url
Satisfy any