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https://fetch.spec.whatwg.org/#fetching [[ If should fetching request be blocked as mixed content ]] It would be lovely to add the UPGRADE hook in before step #3 of the existing algorithm: https://w3c.github.io/webappsec/specs/upgrade/#upgrade-request
https://github.com/whatwg/fetch/commit/fd90b5afd0ff09284c2a3cd093c577d17ce06898