Re: [w3c/ServiceWorker] Service Worker makes AJAX Progress Listener not Working (#1141)

This is about progress on an upload body, right?

The progress may not be right if the service worker script clones or reads the FetchEvent.request's body.  Are you doing that?  Can you post your fetch event handler?

Besides that, I am willing to bet service worker implementations have bugs related to this.  In gecko I am fairly sure we don't pipe back progress from the network socket, through the SW, back to the original XHR.  In theory this could be possible if you do a pass-through like `fetch(event.request)`.

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