python-3.x - .p12 証明書を使用して REST API を認証する方法

Question

ユーザー名とパスワードが記載された certificate.p12 を受け取りました。
システムにこの証明書をインストールした後、ポスト リクエストに Rest Client を使用できます。
この証明書を使用して、Python リクエスト メソッドを使用して REST API でポスト リクエストを認証するにはどうすればよいですか?
以下のコードを使用していますが、機能していません。

import requests
headers = {'Content-Type': 'application/json'}
payload = {'folder': '/Trial/trial_dir'}
response = requests.post('https://<IP>:8080/siteapi/availabletests', params=payload, headers=headers, verify='C:\\Users\\ukhare\\Desktop\\sigos\\cert.p12', auth=('trial_test','trialtest'))

そして、エラーを下回っています：

Traceback (most recent call last):
  File "D:\m\Python34\lib\site-packages\urllib3\connection.py", line 171, in _new_conn
    (self._dns_host, self.port), self.timeout, **extra_kw)
  File "D:\m\Python34\lib\site-packages\urllib3\util\connection.py", line 79, in create_connection
    raise err
  File "D:\m\Python34\lib\site-packages\urllib3\util\connection.py", line 69, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it

During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "D:\m\Python34\lib\site-packages\urllib3\connectionpool.py", line 600, in urlopen
        chunked=chunked)
      File "D:\m\Python34\lib\site-packages\urllib3\connectionpool.py", line 343, in _make_request
        self._validate_conn(conn)
      File "D:\m\Python34\lib\site-packages\urllib3\connectionpool.py", line 849, in _validate_conn
        conn.connect()
      File "D:\m\Python34\lib\site-packages\urllib3\connection.py", line 314, in connect
        conn = self._new_conn()
      File "D:\m\Python34\lib\site-packages\urllib3\connection.py", line 180, in _new_conn
        self, "Failed to establish a new connection: %s" % e)
    urllib3.exceptions.NewConnectionError: <urllib3.connection.VerifiedHTTPSConnection object at 0x036B0230>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "D:\m\Python34\lib\site-packages\requests\adapters.py", line 445, in send
        timeout=timeout
      File "D:\m\Python34\lib\site-packages\urllib3\connectionpool.py", line 638, in urlopen
        _stacktrace=sys.exc_info()[2])
      File "D:\m\Python34\lib\site-packages\urllib3\util\retry.py", line 398, in increment
        raise MaxRetryError(_pool, url, error or ResponseError(cause))
    urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='IP', port=8080): Max retries exceeded with url: /siteapi/availabletests?folder=%2FTrial%2Ftrial_dir (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x036B0230>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it',))

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "D:\m\Python34\lib\site-packages\requests\api.py", line 112, in post
        return request('post', url, data=data, json=json, **kwargs)
      File "D:\m\Python34\lib\site-packages\requests\api.py", line 58, in request
        return session.request(method=method, url=url, **kwargs)
      File "D:\m\Python34\lib\site-packages\requests\sessions.py", line 512, in request
        resp = self.send(prep, **send_kwargs)
      File "D:\m\Python34\lib\site-packages\requests\sessions.py", line 622, in send
        r = adapter.send(request, **kwargs)
      File "D:\m\Python34\lib\site-packages\requests\adapters.py", line 513, in send
        raise ConnectionError(e, request=request)
    requests.exceptions.ConnectionError: HTTPSConnectionPool(host='IP', port=8080): Max retries exceeded with url: /siteapi/availabletests?folder=%2FTrial%2Ftrial_dir (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x036B0230>: Failed to establish a new connection: [WinError 10061] No connection could be made because the target machine actively refused it',))