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I checked Redmine's code, there are no sign why I got a 204. But I did find something related to this: Updating a version through rest API returns invalid JSON
I think maybe I'm using a modified version of Redmine. Anyway, a status of 204 is perfectly valid in such a situation in my opinion, since the project no longer exists. I think maybe we should loose the status code validation, it seems no harm to me to consider all 2xx codes as valid and successful return values.