Yesterday someone edited my question and converted all of my un-encrypted
http:// links to protocol relative
At first I was like "Sweet catch!" because I'm always getting on to our webmaster for a nasty habit they have of hard-coding insecure sources to images, js, and iframes with
src="http://... which flat out won't work over a secure
https:// connection. (At least not without a bunch of permissive "I understand the consequences" clicks on behalf of the client.) So I try to use protocol relative links across the board for a lot of reasons.
But then I noticed all of those linked questions I made to other SE posts disappeared from the "Linked Questions" sidebar. So to test, I rolled back those changes, and the sidebar returned.
This question is very closely related to Relative links are ignored by “Linked Questions”, but I expect some more trickery is involved with host (or folder) relative links rather than protocol relative links.
It's also interesting to note that both
https:// links are recognized as a "linked question." So my specific question is: Why aren't protocol relative links recognized as linked questions? But this question can be deleted if we can get an authoritative answer to How does Stack Overflow find 'Linked' questions?