Github 和 Google 的 Oauth 都成功了，只有 Twitter，点击用 Twitter 登录就会出现这个问题，（localhost:5000/login/twitter）请问如何修复？
这个错误与申请 twitter 开发者帐户时，创建 app 时填写的信息有关吗？twitter 不允许 app 的 website url 是 127.0.0.1 之类的，所以随便填写了一个自己部署在 heroku 的一个网站的 url。
之前在网上做了一些搜索，有几种说法，一种是说要安装 certificate。我在 command line 里运行了这个命令：
pip install certifi
得到结果：
Requirement already satisfied: certifi in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (2018.4.16)
没解决问题。另一种说是可以在urllib.urlopen（）中传递一个 context=ssl._create_default_htttps_context 的参数，但是不太清楚如何把这段代码插入我们的项目代码里？
错误回溯信息如下：
Traceback (most recent call last):
File "/Users/me/.local/share/virtualenvs/chatroom-Pn6Wg-IT/lib/python2.7/site-packages/flask/app.py", line 2295, in wsgi_app
response = self.handle_exception(e)
File "/Users/me/.local/share/virtualenvs/chatroom-Pn6Wg-IT/lib/python2.7/site-packages/flask/app.py", line 1741, in handle_exception
reraise(exc_type, exc_value, tb)
File "/Users/me/.local/share/virtualenvs/chatroom-Pn6Wg-IT/lib/python2.7/site-packages/flask/app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File "/Users/me/.local/share/virtualenvs/chatroom-Pn6Wg-IT/lib/python2.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/Users/me/.local/share/virtualenvs/chatroom-Pn6Wg-IT/lib/python2.7/site-packages/flask/app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/Users/me/.local/share/virtualenvs/chatroom-Pn6Wg-IT/lib/python2.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "/Users/me/.local/share/virtualenvs/chatroom-Pn6Wg-IT/lib/python2.7/site-packages/flask/app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/Users/me/Documents/mystuff/myproject/fwd/chatroom/app/blueprints/oauth.py", line 96, in oauth_login
return providers[provider_name].authorize(callback=callback)
File "/Users/me/.local/share/virtualenvs/chatroom-Pn6Wg-IT/lib/python2.7/site-packages/flask_oauthlib/client.py", line 523, in authorize
token = self.generate_request_token(callback)[0]
File "/Users/me/.local/share/virtualenvs/chatroom-Pn6Wg-IT/lib/python2.7/site-packages/flask_oauthlib/client.py", line 593, in generate_request_token
uri, headers, method=self.request_token_method,
File "/Users/me/.local/share/virtualenvs/chatroom-Pn6Wg-IT/lib/python2.7/site-packages/flask_oauthlib/client.py", line 404, in http_request
resp = http.urlopen(req)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 154, in urlopen
return opener.open(url, data, timeout)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 429, in open
response = self._open(req, data)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 447, in _open
'_open', req)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 407, in _call_chain
result = func(*args)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1241, in https_open
context=self._context)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1198, in do_open
raise URLError(err)
URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:726