CORS not working as documented

Superset version

0.28.1

using docker image with flask-cors==3.0.3

Expected results

able to load dashboard in an iframe

Actual results

Firefox displays : 'Load denied by X-Frame-Options: … ’

Chrome displays : Refused to display ‘https://…’ in a frame because it set ‘X-Frame-Options’ to ‘sameorigin’

Steps to reproduce

I’ve added this option to my configuration py file : ENABLE_CORS = True

I’m 100% sure the right file is in use (I also ave OAuth for instance set in the cofig file, and it is working)

I checked that superset[cors] IS installed in the image (I raun pip install superset[cors] inside the container, which told me eveything was already set)

I refer to this documentation : https://superset.incubator.apache.org/installation.html#cors

If something should be added in CORS_OPTIONS please at least give an example, don’t throw readers to parent full documentation.

Thank you for any advice ! I’m pretty sure it’s not a bug but a configuration issue on my side, but I simply can’t find a configuration explanation to allow cross-origin from any url.