htaccess restrict authentification but exception on file

Question

I've seen a few other relative posts but didn't find any solution.

I need to restrict a folder with authentification, it works. But in this folder I need to keep one file access opened to everybody, I used this but it doesn't works :

AuthName "Admins Only"
AuthUserFile /home/dd/.htpasswd
AuthGroupFile /dev/null
AuthType basic
require user AuthorizedUser
Options -Indexes
<Files "admin-ajax.php">
   Allow from all
   Satisfy all
</Files>

Sorry for my bad english and thanks for help !

Answer 1

use SetEnv and Order directive :

#set variable if uri is "/admin-ajax.php"
SetEnvIf Request_URI ^/folder/admin-ajax\.php noauth=1

#auth 
AuthName "Admins Only"
AuthUserFile /home/dd/.htpasswd
AuthGroupFile /dev/null
AuthType basic
require user AuthorizedUser

 #Here is where we allow/deny
Order Deny,Allow
Satisfy any
Deny from all
Require user AuthorizedUser
Allow from env=noauth

This will let you access your admin-ajax.php without login to server.