How to resolve http and https conflict on vk.com?

Question

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Good afternoon.
We upload a photo to the page, after which we see in the console:

Mixed Content: The page at 'https://site.com/APPS/VK.COM/index.php?api_url=https:…_app_id=4534313_480a5056ccc01cd07a&referrer=unknown&lc_name=e9ae5a9e&hash=...' 
was loaded over HTTPS, but requested an insecure image 
'http://cs622523.vk.me/v62252454/11f87/ij0ueXl7rfI.jpg'. 
This content should also be served over HTTPS.

Does anyone know how to fix the conflict?

PS: replacing http with https in the link to the photo does not work, because photos in vk.com are loaded only via http:// protocol