Re: [whatwg/fetch] Fail request when its streaming body is used in ServiceWorker (#1144)

@MattiasBuelens commented on this pull request.



> @@ -3834,9 +3834,32 @@ optional <i>CORS-preflight flag</i>, run these steps:
   <p>If <var>request</var>'s <a>service-workers mode</a> is "<code>all</code>", then:
 
   <ol>
+   <li><p>Assert: <var>request</var> 's <a for=request>body</a> is either null or a
+   <a for=/>body</a>.
+
+   <li>
+    <p>Let <var>savedBody</var> be a copy of <var>request</var>'s <a for=request>body</a>.

@jakearchibald I think that would work. 👍

I do agree that we should specify how passing a `Request` object between the original realm and the service worker's realm should work. It seems natural to make `Request` transferrable, or at least make sure that we [transfer the body's stream](https://streams.spec.whatwg.org/#rs-transfer).

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