The viewer is designed to request the resources through the Reporting REST Service. Although, I am not certain how the report viewer is setup with this application.
I recommend using the Web Browser's developer tools to discover what is hitting the content deliver network and downloading the assets. To open the developer tools right click anywhere in the page and select inspect element. Then locate the Network tab and refresh the page.
Additionally, the HTML 5 Report Viewer requirements can be found in the Requirements
Please let me know if you need any additional information. Thank you.
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