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[EP-tech] mixed-content warnings

CAUTION: This e-mail originated outside the University of Southampton.
I thought​ that I resolved all of the "mixed content" warnings on our repository a while back, but after a recent upgrade from 3.3.12 to 3.4.3, I noticed that I have some mixed content warnings again, specifically on the thumbnails on the abstract pages.  I might have missed some of these warning before, though, so this might not be a new issue after the upgrade.  

Because I have HSTS headers, the browser redirects those those requests to HTTPS, but I would like to fix it.  Both the SRC and the HREF of the thumbnails for PDFs are referenced as HTTP instead of HTTPS.  The only thing that fixed it during my testing was if I was to remove (comment out) " the $c->{host}  line/ariable in 10_core.pl
That resolves the issue, but I'm worried to apply this change because I don't know if something else might rely on that variable.

I spent a good part of a day trying to follow the code, and I know that the {scheme} variable in URL.pm doesn't get properly set to https in the case of the thumbnails, but the code is so confusing when it comes to the thumbnail URLs that I can't figure out why.  I do have a suspicion that there is a bug in the core code somewhere, but perhaps it is something in our own configuration. 
I know this issue is not new to this list, in fact, I wrote the first drafts of the HSTS page on the Wiki (https://wiki.eprints.org/w/HTTPS-only_and_HSTS), but looking through the updated page there and any recent exchanges that relate to this didn't help me figure it out.  
Let me know if you have any ideas?

Best wishes,
Tomasz