Re: [w3ctag/design-reviews] Request for review: Preload (#202)

> ... the Accept header on the HTML request is not providing information about the client's preferred image formats.
> That's not true, and we learned this the hard way a few times over now.

My testing indicates that browsers do send different Accept headers based on the instigator of the request (and in the case of preload, the value of `as`). It seems therefore conceivable to me that a request for one type of resource which prompts a push of a different type of resource, would leave the server in an uncertain position if there were multiple variants of the pushable resource available.  Are you saying that this is never a problem, or it's not a problem as long as pushes are only done in response to navigation requests, or that I'm wrong about the variation in the value of Accept?

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