使用python-jenkins时HTTP错误503服务不可用

我刚接触Python，并尝试使用python-jenkins来打印“ whoami”。我使用Python 3.6和Windows 10

import jenkins
server = jenkins.Jenkins('http://10.1.nn.nnn:8080')
uname = server.get_whoami()

并且错误并显示以下消息。我在日常活动中使用了上述网址

Traceback (most recent call last):
  File "C:\Users\sathishkumar.kailas\AppData\Local\Programs\Python\Python36\lib\site-packages\jenkins\__init__.py", line 793, in get_whoami
    'GET', self._build_url(WHOAMI_URL, locals())
  File "C:\Users\sathishkumar.kailas\AppData\Local\Programs\Python\Python36\lib\site-packages\jenkins\__init__.py", line 556, in jenkins_open
    return self.jenkins_request(req, add_crumb, resolve_auth).text
  File "C:\Users\sathishkumar.kailas\AppData\Local\Programs\Python\Python36\lib\site-packages\jenkins\__init__.py", line 572, in jenkins_request
    self.maybe_add_crumb(req)
  File "C:\Users\sathishkumar.kailas\AppData\Local\Programs\Python\Python36\lib\site-packages\jenkins\__init__.py", line 370, in maybe_add_crumb
    'GET', self._build_url(CRUMB_URL)), add_crumb=False)
  File "C:\Users\sathishkumar.kailas\AppData\Local\Programs\Python\Python36\lib\site-packages\jenkins\__init__.py", line 556, in jenkins_open
    return self.jenkins_request(req, add_crumb, resolve_auth).text
  File "C:\Users\sathishkumar.kailas\AppData\Local\Programs\Python\Python36\lib\site-packages\jenkins\__init__.py", line 575, in jenkins_request
    self._request(req))
  File "C:\Users\sathishkumar.kailas\AppData\Local\Programs\Python\Python36\lib\site-packages\jenkins\__init__.py", line 535, in _response_handler
    response.raise_for_status()
  File "C:\Users\sathishkumar.kailas\AppData\Local\Programs\Python\Python36\lib\site-packages\requests\models.py", line 940, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 503 Server Error: Service Unavailable for url: http://10.1.nn.nnn:8080/crumbIssuer/api/json

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File 
"C:\Users\sathishkumar.kailas\AppData\Local\Programs\Python\Python36\lib\sitepackages\jenkins\__init__.py", line 804, in get_whoami
    % self.server)

我用Google搜索，但无法获得正确的URL来解决此问题