Hi Benjamin,
Please keep in mind that snaps by default run in their sandbox. Interfaces allow access to a resource outside of a snap’s confinement.
You have to configure these interfaces for your application in your snapcraft.yaml. Here you can see a list of interfaces to connect to. You could also look at the snapcraft.yaml (folder: /snap) of the python webserver example and check which interfaces are used here.
Best regards,
Nick
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