At the moment flask-restful has a limitation where it cannot return a mimetype that is different from the requesting mimetype (it ignores the Accept header). A work-around might be possible by designing a custom api class.
For more info see flask-restful/flask-restful#726 and https://stackoverflow.com/questions/47654056/flask-attempting-to-serialize-as-json-despite-mimetype-text-plain.
At the moment
flask-restfulhas a limitation where it cannot return a mimetype that is different from the requesting mimetype (it ignores theAcceptheader). A work-around might be possible by designing a custom api class.For more info see flask-restful/flask-restful#726 and https://stackoverflow.com/questions/47654056/flask-attempting-to-serialize-as-json-despite-mimetype-text-plain.