Ajax request detection in htaccess

.htaccess

ErrorDocument 404 NotFound
ServerSignature Off
Options +FollowSymLinks

<IfModule mod_rewrite.c>
	RewriteEngine on

	RewriteCond %{REQUEST_FILENAME} !-f
	RewriteCond %{REQUEST_FILENAME} !-d

	RewriteCond %{REQUEST_METHOD} ^(GET)$
	RewriteCond %{HTTP:X-Requested-With} XMLHttpRequest [NC] # i had to add no case to work
	RewriteRule ^(.*)$ script.php?url=$1&get=true [NC,L,QSA]

	RewriteCond %{REQUEST_METHOD} ^(POST)$
	RewriteCond %{HTTP:X-Requested-With} XMLHttpRequest [NC]
	RewriteRule ^(.*)$ script2.php?url=$1&post=true [NC,L,QSA]
</IfModule>