def get_recentlist():
    req_data = json.loads(request.data)
    limit = req_data.get('limit')
    if limit:
        query_result = LeancloudUtils.get_recent_tracelist(limit)
    else:
        query_result = LeancloudUtils.get_recent_tracelist()
    ids = []
    for item in query_result:
        ids.append(item.id)
    resp = make_response(json.dumps(ids), 200)
    # resp.headers['Access-Control-Allow-Origin'] = '*'
    resp.headers["Access-Control-Allow-Headers"] = "content-type"
    return resp