I found a Chinese blog yesterday: https://www.aliengu.com/
It uses some pictures from clouddn.com , one of the most popular Chinese image hosting, do not support https.
@guxi own this blog, he answered me that he won't change image hosting recently.
So, I have added it to UpgradeMixedContentBlacklist right now.
Test url: https://www.aliengu.com/archives/1904
By the way, this blog post is the best observation and prophecy I've ever seen about steemit.
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