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I've been getting a very strange error when sending HTTPS post requests, I've found a few similar reports, but I haven't found a solution yet. If you have any suggestions, they would be greatly appreciated!

Traceback (most recent call last):
 File "C:/Data/Python Projects/Experement.py", line 14, in send_request
 return requests.post(URL + '/verify', proxies=proxy).json()
 File "C:Python27libsite-packagesrequestsapi.py", line 88, in post
 return request('post', url, data=data, **kwargs)
 File "C:Python27libsite-packagesrequestsapi.py", line 44, in request
 return session.request(method=method, url=url, **kwargs)
 File "C:Python27libsite-packagesrequestssessions.py", line 456, in request
 resp = self.send(prep, **send_kwargs)
 File "C:Python27libsite-packagesrequestssessions.py", line 559, in send
 r = adapter.send(request, **kwargs)
 File "C:Python27libsite-packagesrequestsadapters.py", line 327, in send
 timeout=timeout
 File "C:Python27libsite-packagesrequestspackagesurllib3connectionpool.py", line 488, in urlopen
 conn = self._get_conn(timeout=pool_timeout)
 File "C:Python27libsite-packagesrequestspackagesurllib3connectionpool.py", line 222, in _get_conn
 return conn or self._new_conn()
 File "C:Python27libsite-packagesrequestspackagesurllib3connectionpool.py", line 683, in _new_conn
 return self._prepare_conn(conn)
 File "C:Python27libsite-packagesrequestspackagesurllib3connectionpool.py", line 647, in _prepare_conn
 conn.connect()
 File "C:Python27libsite-packagesrequestspackagesurllib3connection.py", line 179, in connect
 self._tunnel()
 File "c:Python27Libhttplib.py", line 759, in _tunnel
 line = response.fp.readline(_MAXLINE + 1)
TypeError: readline() takes exactly 1 argument (2 given)

This seems to be an open bug in httplib: http://bugs.python.org/issue17849. There's a short patch attached to the issue, so you could just apply that to your copy of httplib.py.

I had a quick look through the commit histories of connection.py in urllib3 and Requests' copy of urllib3, but it didn't seem like any workaround had been applied.

As you can see in here:

line = response.fp.readline(_MAXLINE + 1)
TypeError: readline() takes exactly 1 argument (2 given)

the request's function readline does not accepts arguments other than 'self'. So it's indeed a library bug.

At the end of this discussion: https://github.com/requests/requests/issues/2159, suggests that could be a missconfigured proxy who triggers the bug, also that bug was fixed on python 2.7 as you can see here: https://bugs.python.org/issue17849

Maybe you can consider upgrade to python3, and requests library as well.