Re: [w3c/ServiceWorker] Have "Handle Fetch" return the request body in addition to response (#1563)

@annevk commented on this pull request.



> @@ -3032,6 +3032,7 @@ spec: webappsec-referrer-policy; urlPrefix: https://w3c.github.io/webappsec-refe
                   1. Wait until |e|'s [=FetchEvent/wait to respond flag=] is unset.
                   1. If |e|'s [=FetchEvent/respond-with error flag=] is set, set |handleFetchFailed| to true.
                   1. Else, set |response| to |e|'s [=FetchEvent/potential response=].
+              1. If |response| is null, |request|'s [=request/body=] is not null, |request|'s [=request/body=]'s [=Body/source=] is null, and |request|'s [=request/body=] is [=Body/unusable=], set |handleFetchFailed| to true.

The second check here is redundant with checking whether it is unusable. In order for a body to be unusable it has to be non-null.

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