Re: [whatwg/fetch] WIP: Add a mechanism to fetch to track progress (PR #1843)

@lukewarlow commented on this pull request.



> +   <li><p>If one or more <a event><code>progress</code></a> event listeners were added to
+   <var>requestObserver</var>, then set <var>hasUploadListeners</var> to true.

The reason for this was that XHR triggers CORS mode when there's upload listeners.

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