Re: [w3c/ServiceWorker] Should synthetic responses be validated? (#1571)

In the case where they don't match it becomes a network error in HTTP/1 (maybe also other versions, unclear). https://fetch.spec.whatwg.org/#content-length-header is the start toward documenting that.

However, we are not using `Content-Length` to parse the response as we do when a response comes from the network. E.g., a `Content-Length` on a synthetic response that's too long or too short doesn't influence the body of the response one way or another. So I don't think looking for precedent there is meaningful.

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