Hotlink Protection breaks the PDF images

  • If the .htaccess has this code…

    RewriteEngine on
    RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?mydomain.com [NC]
    RewriteRule \.(jpg|jpeg|png|gif|mp4|avi|pdf|mp3|mvi)$ https://mydoamin.com/bad_image.jpg [NC,R,L]

    …the images do not display in the PDF but if I add one extra line…

    RewriteEngine on
    RewriteCond %{HTTP_REFERER} !^$
    RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?mydomain.com [NC]
    RewriteRule \.(jpg|jpeg|png|gif|mp4|avi|pdf|mp3|mvi)$ https://mydoamin.com/bad_image.jpg [NC,R,L]

    … it does load. It seems allowing blank referers is required. Although it works for the PDF, it does not keep the integrity of the hotlink protection

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