运行一下就卡住退出，我就debug，发现这里返回不了json数据，我把代码单独拎出来测试也是一样，网址单独访问浏览器显示正常，怎么解决？

import requests

import json

def query(date, from_station, to_station):

    url = 'https://kyfw.12306.cn/otn/leftTicket/query?leftTicketDTO.train_date={}&leftTicketDTO.from_station={}&leftTicketDTO.to_station={}&purpose_codes=ADULT'.format(date, from_station, to_station)

    print(url)

    response = requests.get(url)

    result = response.json()

    print(result)

    # result = result['data']['result']

query('2020-09-03', 'SHH', 'BJP')

https://kyfw.12306.cn/otn/leftTicket/query?leftTicketDTO.train_date=2020-09-03&leftTicketDTO.from_station=SHH&leftTicketDTO.to_station=BJP&purpose_codes=ADULT

Traceback (most recent call last):

  File "C:/Users/lihui/Desktop/gf.py", line 14, in <module>

    query('2020-09-03', 'SHH', 'BJP')

  File "C:/Users/lihui/Desktop/gf.py", line 9, in query

    result = response.json()

  File "D:\Program Files\Python38\lib\site-packages\requests\models.py", line 898, in json

    return complexjson.loads(self.text, **kwargs)

  File "D:\Program Files\Python38\lib\json\__init__.py", line 357, in loads

    return _default_decoder.decode(s)

  File "D:\Program Files\Python38\lib\json\decoder.py", line 337, in decode

    obj, end = self.raw_decode(s, idx=_w(s, 0).end())

  File "D:\Program Files\Python38\lib\json\decoder.py", line 355, in raw_decode

    raise JSONDecodeError("Expecting value", s, err.value) from None

json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)