The fetch spec recently changed to add support for X-Content-Type-Options and "nosniff": https://github.com/whatwg/fetch/issues/35 We don't support this for network requests in general, though. See bug 471020.
I don't think there is anything to do here beyond what bug 471020 implemented.
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 471020
Component: DOM → DOM: Core & HTML
Product: Core → Core
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