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I understand  Timeouts can be a bit difficult to pin down though, as not receiving so much as an error response means you're mostly left with guess work and trial and error, unfortunately.

I've just tested dozens of times without any issue, strangely enough. I suppose that rules out rate-limiting, unless it's of a more targeted nature. Maybe someone else has an idea to help narrow down potential causes. In case it's of any help, many large image hosts which support HTTPS will do HTTP redirecting (for example, Imgur).