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

@annevk 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 ???

It happens when you do a request and the server returns a challenge. Then you have to repeat the request addressing the challenge. This happens with HTTP authentication at least. I'm not sure about client certificates as they happen at the TLS level, so maybe not?

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