curl --location -g --request PUT 'http://gitlab.example.com/v3/projects//milestones/' \
--data-urlencode 'title=' \
--data-urlencode 'state_event=' \
--data-urlencode 'description=' \
--data-urlencode 'due_date=' \
--data-urlencode 'start_date='{
"id": "string",
"iid": "string",
"project_id": "string",
"title": "string",
"description": "string",
"state": "string",
"created_at": "string",
"updated_at": "string",
"due_date": "string",
"start_date": "string"
}