In my setup, for reasons unrelated to this post, http://api.stackexchange.com web-site appears to be missing most of its resources, since even though the site itself is served over the
http:// address scheme, a whole bunch of other rather mandatory Stack resources are hardlinked from
https:// (with certs issued by COMODO and/or Cloudflare).
The same is true of the
i.stack.imgur.com images in the blog, e.g., http://blog.stackoverflow.com/2015/09/were-changing-our-name-back-to-stack-overflow/ has a couple of "enter image description here", and no images. No other Stack resources appear affected.
Perhaps it's possible to implement relative addressing,
//, in place of the absolute ones,