nuxeo-simflofy fails to display preview of related blob

Using the nuxeo-simflofy plugin for a demo, we noticed that displaying a preview of the blob failed, because the URL used was not authenticated.

The fix was signed and in the "demoG2018 branch, at the time the plugin was in nuxeo sandbox.

Looking at the code I see it was not reported.

The fix to apply is this one: https://github.com/nuxeo-sandbox/nuxeo-simflofy/commit/60f3ea64b869713bf8882051d9d5dcaff4df45ee