How to enable hotlink protection in .htaccess for LSWS?

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A hotlink occurs when someone embeds content from your site in another site and uses your bandwidth to serve the files.

On cPanel, there is a hotlink protection feature you can enable for apache, “cPanel » Home » Security » Hotlink Protection” and enable/disable hotlink protection. but this may not work for LSWS. How to enable hotlink protection on LSWS? You can add the following rewrite rules to .htaccess of related domains:

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?testing.quicserver.com/.*$ [NC]
RewriteRule \.(jpg|jpeg|gif|png|bmp)$ - [F]