My question is similar to this one, but I\'m using html & javascript only.
If I try to load this image over https it shows the image just fine.
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It's called "bandwidth theft" or rather prevention thereof.
Over HTTPS your referrer doesn't get sent, but over HTTP it does. In the latter case, IMDb apparently refuses to show their assets on your site. This is also shown if you visit the URL: "Referral Denied".
You are not allowed to link to or rehost IMDb assets:
Framing: You may not frame or utilize framing techniques to enclose any trademark, logo, or other proprietary information (including images, text, page layout, or form) of IMDb without express written consent.