          return {
              '200': {
                  'content': {
                      ct: {'schema': response_schema}
                      for ct in self.content_types
                  },
                  # description is a mandatory property,
                  # https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md#responseObject
                  # TODO: put something meaningful into it
                  'description': ""
 
</s> remove                 for ct in self.content_types
 </s> add                 for ct in self.request_media_types </s> remove     content_types = ['application/json']
 </s> add     request_media_types = []
    response_media_types = []

                    for ct in self.response_media_types
          return {
              '200': {
                  'content': {
                      ct: {'schema': response_schema}
                    for ct in self.response_media_types
                  },
                  # description is a mandatory property,
                  # https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md#responseObject
                  # TODO: put something meaningful into it
                  'description': ""
keep keep keep keep replace keep keep keep keep keep
 OpenAPI: Map renderers/parsers for request/response media-types. (#6865) 
rest_framework/schemas/openapi.py