接口https://api.mch.weixin.qq.com/pay/orderquery返回的header不同，导致库解码的时候编码错误。这个是一个海外商户号。

同样的调用代码，有时候返回`application/xml`，有时候返回`text/plain`。

>>> q = interface.OverseaWechatQueryOrder();q.query({'ooid': '200162437'})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/uu/project/uupay/virtualenv/lib/python3.5/site-packages/uukit-1.13.8-py3.5.egg/uukit/interface.py", line 1159, in query
    return self.post(data=data_xml, headers=headers)
  File "/home/uu/project/uupay/virtualenv/lib/python3.5/site-packages/uukit-1.13.8-py3.5.egg/uukit/interface.py", line 94, in post
    return self._query(data, headers, requests.post, **kwargs)
  File "/home/uu/project/uupay/virtualenv/lib/python3.5/site-packages/uukit-1.13.8-py3.5.egg/uukit/interface.py", line 86, in _query
    self._analyze()
  File "/home/uu/project/uupay/virtualenv/lib/python3.5/site-packages/uukit-1.13.8-py3.5.egg/uukit/interface.py", line 1184, in _analyze
    self._response_txt = util.ensure_binary(self._response_txt, 'latin1').decode(config.PAY.OVERSEA_WECHAT_ENCODE)
  File "/home/uu/project/uupay/virtualenv/lib/python3.5/site-packages/uukit-1.13.8-py3.5.egg/uukit/util.py", line 529, in ensure_binary
    s = s.encode(encode)
UnicodeEncodeError: 'latin-1' codec can't encode characters in position 206-210: ordinal not in range(256)
>>> q.response.headers
{'Connection': 'keep-alive', 'Request-ID': '08C5C9D4FF0510B70318B9B1B74C20B72B28C9B704-0, 08C5C9D4FF0510B8031891AFB74C20A68B0828DF5E-0', 'Cache-Control': 'no-cache, must-revalidate', 'Content-Type': 'application/xml; charset=utf-8', 'Content-Length': '442', 'X-Content-Type-Options': 'nosniff', 'Server': 'nginx', 'Keep-Alive': 'timeout=8', 'Date': 'Wed, 06 Jan 2021 02:47:33 GMT'}

>>> q = interface.OverseaWechatQueryOrder();q.query({'ooid': '200162437'})
'FAIL'
>>> q.response.headers
{'Connection': 'keep-alive', 'Request-ID': '08CFC8D4FF0510E9061886C08C5820D24F28969203-0, 08CFC8D4FF0510DE0618EBB2C05520944A28F8F405-0', 'MMLAS-VERIFYRESULT': 'CAA=', 'Content-Type': 'text/plain', 'Content-Length': '442', 'Server': 'nginx', 'Keep-Alive': 'timeout=8', 'Date': 'Wed, 06 Jan 2021 02:45:35 GMT'}