Re: [ServiceWorker] HEAD request on Cache API should not return response with body (#655)

Node's `http.request` appears to be a little more strict. It throws if the line ends are `\n` rather than `\r\n`, it also throws if it receives a body in response to a HEAD request.

I think following the browser's leniency is fine here, but it should be in the fetch spec.

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https://github.com/slightlyoff/ServiceWorker/issues/655#issuecomment-88097955