Using OAuth with fdk run gives CORS error


I have a cti_global_sidebar app that makes use of the OAuth flow.
The documentation states that I should be able to test this using “fdk run”. However when doing this I see the error as displayed below. If I install the app as a custom app, it works correctly.

Documentation: OAuth

ERROR below:
Mixed Content: The page at ‘Loading...’ was loaded over HTTPS, but requested an insecure frame ‘’. This request has been blocked; the content must be served over HTTPS.

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