I wouldn't have thought that was needed. Calibre knows what metadata writer plugins it has and what formats they support. If that is built for the server at startup, it should be able to handle formats correctly. But, maybe the server is not loading all the plugins.
In any case, I'm not sure what the state of the new server is. I can start it and reach it from a browser, but I get an empty file as a response. It's probably a configuration problem on my part, but I can't see it right now.
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