Cache forever embedded content from Instagram, Facebook, etc

[sobrenome]

One big problem with old forum communities is 404 errors with pasted images from other websites that eventually are ended.

This problem was fixed by the proxy caching with the never expires option.

But the embed feature of many services like Instagram, Facebook and others does not take the advantage of the proxy caching.

Please, add this feature to protect the communities of loosing content if the original posts from this websites are deleted.

Thanks!