Re: [fetch] Feed a Response to existing APIs (#49)

> Note that a stream doesn't have the metadata that a response does have. Most APIs want (some of) that metadata.

You mean the http headers or something else?

I have to say I prefer setting the Response object to creating some kind of URL.  I like the concept that a Response is essentially an evaluated URL.

It seems setting a `img.src = new Request(...)` with an implied `fetch()` would be closer to what assigning a URL currently does.

It would be also nice if we could set img.src to a Promise<Response>.  So `img.src = cache.match(req)`.

Unless there is some time pressure forcing a short term solution, it would be nice to go the object route instead of creating a complex new URL type to intermediate.

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