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http://fetch.spec.whatwg.org/#concept-request-context [[ context ]] It might make sense to add a "prefetch" context to cover things like `<link rel="{prefetch,subresource,...}" ...>` (do those even go through Fetch? The HTML spec is unclear about the mechanisms involved: http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#link-type-prefetch).
I'd change the title of this bug to "Add a 'prefetch' context to Fetch?", but I'm getting lovely 408 responses. :(
These should go through Fetch in the end I guess, we only want to end up with a single fetch layer. Chrome also had prerender and such, do we need those too?
I guess we can always add those later. https://github.com/whatwg/fetch/commit/ca784a76050352fbc4ceb61e39ae71475197398c