https://developers.weixin.qq.com/doc/offiaccount/Analytics/Graphic_Analysis_Data_Interface.html

    url = f"https://api.weixin.qq.com/datacube/getarticlesummary?access_token={token}"

    payload = {"begin_date": "2021-09-14", "end_date": "2021-09-15"}

    r = requests.post(url=url, data=json.dumps(payload))

请问我如此调用，为嘛告诉我日期区间错误，我区间日期换了好几个了，都不行。