I should add that I selected "cloaking".
It may be related to your webserver's configuration, not configured allowing to connect with a certain hostname.
If it is not this, I'm afraid that nobody can help without knowing this myname and myportlessname to reproduce this...
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The server (a Xojo web app) has a security setting that rejects requests from iFrames. After setting that to allow iFrame requests, it works fine.
Yes, indeed, cloaking generates frames (not iFrames) where the content is loaded. This must have been the reason. Well done!