For several years I have uploaded high quality photographs from the UK Ministry of Defence database and would like to move to url uploads rather than local caches. The upload links after a header redirect look like www.defenceimagery.mod.uk/fotoweb/cmdrequest/rest/Download.fwx/45153802.jpg - along with an auto-generated session cookie parameter.
I'm guessing that white-listing www.defenceimagery.mod.uk would be sufficient.
Example past images: Here