使用请求库的 xml 获取导致异常

Question

我是 Python 编程新手，曾尝试研究我的问题，但目前还没有找到解决方案。我希望有人可以提供帮助。

我有一个脚本可以对用于激活或停用网络中继开关的 IP 地址进行 http get 调用。代码的相对部分如下所示：

import requests
r = requests.get('http://192.168.1.100/state.xml?relayState=1&noReply=0')

上面成功打开了网络中继开关，但是来自网络中继的响应导致如下所示的一些异常消息，并且脚本停止执行。为了我的脚本的目的，我不需要处理任何响应，但如果我需要为了使脚本正常运行，我会的。我的预感是问题围绕使用 xml 版本 1.0 而不是 1.1 的 Web 中继开关。我还没有找到强制请求使用 1.0 的方法。我正在使用 Python 3.6.1

Traceback (most recent call last):
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\packages\urllib3\connectionpool.py", line 600, in urlopen
    chunked=chunked)
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\packages\urllib3\connectionpool.py", line 386, in _make_request
    six.raise_from(e, None)
  File "<string>", line 2, in raise_from
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\packages\urllib3\connectionpool.py", line 382, in _make_request
    httplib_response = conn.getresponse()
  File "C:\Program Files (x86)\Python36-32\lib\http\client.py", line 1331, in getresponse
    response.begin()
  File "C:\Program Files (x86)\Python36-32\lib\http\client.py", line 297, in begin
    version, status, reason = self._read_status()
  File "C:\Program Files (x86)\Python36-32\lib\http\client.py", line 279, in _read_status
    raise BadStatusLine(line)
http.client.BadStatusLine: <?xml version='1.0' encoding='utf-8'?>



During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\adapters.py", line 423, in send
    timeout=timeout
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\packages\urllib3\connectionpool.py", line 649, in urlopen
    _stacktrace=sys.exc_info()[2])
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\packages\urllib3\util\retry.py", line 347, in increment
    raise six.reraise(type(error), error, _stacktrace)
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\packages\urllib3\packages\six.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\packages\urllib3\connectionpool.py", line 600, in urlopen
    chunked=chunked)
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\packages\urllib3\connectionpool.py", line 386, in _make_request
    six.raise_from(e, None)
  File "<string>", line 2, in raise_from
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\packages\urllib3\connectionpool.py", line 382, in _make_request
    httplib_response = conn.getresponse()
  File "C:\Program Files (x86)\Python36-32\lib\http\client.py", line 1331, in getresponse
    response.begin()
  File "C:\Program Files (x86)\Python36-32\lib\http\client.py", line 297, in begin
    version, status, reason = self._read_status()
  File "C:\Program Files (x86)\Python36-32\lib\http\client.py", line 279, in _read_status
    raise BadStatusLine(line)
requests.packages.urllib3.exceptions.ProtocolError: ('Connection aborted.', BadStatusLine("<?xml version='1.0' encoding='utf-8'?>\r\n",))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "E:/Software/Python/test3.py", line 3, in <module>
    r = requests.get('http://192.168.1.100/state.xml?relayState=1')
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\api.py", line 70, in get
    return request('get', url, params=params, **kwargs)
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\api.py", line 56, in request
    return session.request(method=method, url=url, **kwargs)
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\sessions.py", line 488, in request
    resp = self.send(prep, **send_kwargs)
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\sessions.py", line 609, in send
    r = adapter.send(request, **kwargs)
  File "C:\Program Files (x86)\Python36-32\lib\site-packages\requests\adapters.py", line 473, in send
    raise ConnectionError(err, request=request)
requests.exceptions.ConnectionError: ('Connection aborted.', BadStatusLine("<?xml version='1.0' encoding='utf-8'?>\r\n",))
>>> 

Answer 1

您确定网址应该是 http 而不是 https？这是某人的问题：Python requests.exception.ConnectionError: connection aborted "BadStatusLine"

否则，异常意味着错误来自服务器的响应，我假设您无法控制。您可以与控制它的任何人一起打开支持票证，或者，如果您赶时间，您可以通过捕获并忽略异常来解决它，这很骇人听闻，但您可能可以接受，因为您不需要响应并且知道您的请求在另一端是成功的：

try:
    requests.get('http://192.168.1.100/state.xml?relayState=1&noReply=0')
except requests.exceptions.ConnectionError as err:
    if "BadStatusLine" in repr(err):
        # TODO: be a responsible developer and figure out why I get BadStatusLine
        pass
    else:
        # wasn't the error I was expecting, so raise it
        raise

对于生产代码，我想找出错误的根源，但在开发过程中，我可能愿意执行以下操作，以便继续前进。

Answer 2

我是上述网络继电器开关产品制造商的技术支持专家。最近的一封支持电子邮件提到了此线程，我认为为可能遇到此问题的任何其他人添加信息会很好。

很久以前设计的几个旧模块硬件资源有限，不支持 XML 响应的完整 HTML 标头。

几年前，这些产品使用更新的硬件进行了重新设计。出于向后兼容性的原因，/state.xml 响应仍然没有完整的 HTML 标头来适应那些为旧硬件系列开发软件的人。

较新的产品现在支持完整的 HTML 标头，但必须提出不同的请求 - /stateFull.xml。

原始示例的正确代码如下：

import requests
r = requests.get('http://192.168.1.100/stateFull.xml?relayState=1&noReply=0')

注意：第一次提交到 StackOverflow，所以对于错过任何通常遵循的约定，我深表歉意。