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

@annevk 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>.

And the service worker cannot obtain a lock and transfer it?

For the non-service worker case this is happening in https://fetch.spec.whatwg.org/#concept-request-transmit-body which seems to be invoked way too late as it should happen before `fetch()` has returned... This might also be a problem for responses?

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