POST请求的json解码在python中失败

Question

此错误已在很多线程中进行了讨论，在发布此问题之前，我尝试了所有这些方法！他们都没有解决我的问题，我继续遇到同样的错误。但是在浏览器中打开相同的URL时，它确实返回有效的json响应。仅在我的python代码中失败了。

这是我的代码，

url = 'https://<some-site-name>'

headers = {'some headers'}

payload = {'some payload'}

req = requests.post(url, data=payload, headers=headers)

print(req.json()) **-> errors appears on this line**

下面是详细的错误日志，

Traceback (most recent call last):
File "/home/ssh/testcode/kpp_login.py", line 142, in <module>
print(req.json())

File "/home/ssh/.local/lib/python2.7/site-packages/requests/models.py",     line 896, in json
return complexjson.loads(self.text, **kwargs)

File "//home/ssh/.local/lib/python2.7/site-packages/simplejson /__init__.py",  line 518, in loads
return _default_decoder.decode(s)

File "/home/ssh/.local/lib/python2.7/site-packages/simplejson/decoder.py", line 370, in decode
obj, end = self.raw_decode(s)

File "/home/ssh/.local/lib/python2.7/site-packages/simplejson/decoder.py", line 400, in raw_decode

return self.scan_once(s, idx=_w(s, idx).end())

JSONDecodeError: Expecting value: line 1 column 1 (char 0)