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

@yutakahirano 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>.

The point I'm trying to make is that it overwrites the request's body's stream and that means request will not be disturbed nor locked. I'd like to fail the request in such a case too (if other conditions are met). This corresponds to "clone-and-ignore" tests in https://github.com/web-platform-tests/wpt/pull/27325.

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