htaccess hotlink exception not working

[kontrol]

i made this htaccess code but the third line that is supposed to exempt the 'boost' from the hot linking stoppage actually prevents all images in the site from displaying.

RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?localhost/urban/.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} !^http://(www\.)?localhost/boost/.*$ [NC]
RewriteRule \.(gif|jpg|bmp|png)$ - [F]

[joshmac]

Try this and see if it works:

RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?localhost/boost [NC]