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docs: clarify documentation about listening to progress events (#28892) 

PR Close #28892
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Oscar Busk 2019-02-22 17:48:44 +01:00 committed by Ben Lesh
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aio/content/guide/http.md
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@ -865,6 +865,9 @@ with the `reportProgress` option set true to enable tracking of progress events.
Every progress event triggers change detection, so only turn them on if you truly intend to report progress in the UI. Every progress event triggers change detection, so only turn them on if you truly intend to report progress in the UI.
When using [`HttpClient#request()`](api/common/http/HttpClient#request) with an HTTP method, configure with
[`observe: 'events'`](api/common/http/HttpClient#request) to see all events, including the progress of transfers.
</div> </div>
Next, pass this request object to the `HttpClient.request()` method, which Next, pass this request object to the `HttpClient.request()` method, which