Image annotation does not work when deployed behind proxy

[janostik]

How to reproduce the behaviour

UI is running on URL: https://my-domain.doccano.com/

Images are not loaded as seen on screenshot below

The reason is that the URL of the image returned is internal URL of the backend and not url starting with https://my-domain.doccano.com/

There isn't any mention of a env variable which can be set, to instruct the backend on which domain the app is being deployed on. I would expect to be able to setup some environemnt variable such as API_URL or DOMAIN_URL where I would specify: https://my-domain.doccano.com/

Your Environment

• How did you install doccano (Heroku button etc): Deployed on kubernetes. UI is exposed behind gateway.