Conversation - Downvote question
Increments the unhelpful attribute of the question by 1.
It is your responsibility to restrict users of your website from sending multiple requests for the same question.
|question_id||id of the conversation question|
By HTTP status:
- 202 Accepted - action was successful and will be processed asynchronously
- 404 Not Found - conversation question with given ID does no exist or you are not authorised to access it