Re: [whatwg/fetch] Replace request's "window" with "traversable for user prompts" (PR #1823)

@domenic commented on this pull request.



> @@ -5517,10 +5560,13 @@ run these steps:
   <a for="fetch params">canceled</a>:
 
   <ol>
-   <li><p>If <var>request</var>'s <a for=request>window</a> is "<code>no-window</code>" and
-   <var>request</var>'s <a for=request>redirect mode</a> is "<code>error</code>", then set
-   <var>httpFetchParams</var> to <var>fetchParams</var> and <var>httpRequest</var> to
-   <var>request</var>.
+   <li>
+    <p>If <var>request</var>'s <a for=request>traversable for user prompts</a> is "<code>no-traversable</code>" and
+    <var>request</var>'s <a for=request>redirect mode</a> is "<code>error</code>", then set
+    <var>httpFetchParams</var> to <var>fetchParams</var> and <var>httpRequest</var> to
+    <var>request</var>.
+
+    <p class=note>If user prompts are possible, then we need to clone <var>request</var> because ???

I added that, although I'm not 100% sure I understand when that would happen. Who gets the request the first time, and who gets it the second time? Does this occur for all 3 possible prompt causes (WWW-Authenticate, PACs, and TLS client certs) or just some of them?

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