Capture HTTP(S) with Fiddler

Open up your favorite browser, and simply navigate to the URL of the installable cloud app. You will see the requests sent to PowerServer in the section containing list of sessions, (the left pane)

After selecting one of those sessions, click on Inspectors tab, then the TextView tabs to view the request sent to the server and also the response returned from the server.

If the response body is encoded, click to decode: