ssl.SSLCertVerificationError for flask application OAuth login with keycloak

I have referred a sample hello-world flask app integrated with key-cloak login from https://gist.github.com/thomasdarimont/145dc9aa857b831ff2eff221b79d179a

My client-secrets.json is as follows:

{
    "web": {
        "issuer": "https://keycloak-keycloak.router.default.svc.cluster.local.167.254.224.26.nip.io/auth/realms/myrealm",
        "auth_uri": "https://keycloak-keycloak.router.default.svc.cluster.local.167.254.224.26.nip.io/auth/realms/myrealm/protocol/openid-connect/auth",
        "client_id": "myclient",
        "client_secret": "****",
        "redirect_uris": [
            "https://167.254.224.26:30397/*"
        ],
        "userinfo_uri": "https://keycloak-keycloak.router.default.svc.cluster.local.167.254.224.26.nip.io/auth/realms/myrealm/protocol/openid-connect/userinfo",
        "token_uri": "https://keycloak-keycloak.router.default.svc.cluster.local.167.254.224.26.nip.io/auth/realms/myrealm/protocol/openid-connect/token",
        "token_introspection_uri": "https://keycloak-keycloak.router.default.svc.cluster.local.167.254.224.26.nip.io/auth/realms/myrealm/protocol/openid-connect/token/introspect"
    }
}

When I run python app.py it runs successfully but once I browse the app url and click on login, it takes me to keycloack login page, after I enter my credentials I get the following error

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2309, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2295, in wsgi_app
    response = self.handle_exception(e)
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1741, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/usr/local/lib/python3.7/site-packages/flask_oidc/__init__.py", line 657, in _oidc_callback
    plainreturn, data = self._process_callback('destination')
  File "/usr/local/lib/python3.7/site-packages/flask_oidc/__init__.py", line 689, in _process_callback
    credentials = flow.step2_exchange(code)
  File "/usr/local/lib/python3.7/site-packages/oauth2client/_helpers.py", line 133, in positional_wrapper
    return wrapped(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/oauth2client/client.py", line 2054, in step2_exchange
    http, self.token_uri, method='POST', body=body, headers=headers)
  File "/usr/local/lib/python3.7/site-packages/oauth2client/transport.py", line 282, in request
    connection_type=connection_type)
  File "/usr/local/lib/python3.7/site-packages/httplib2/__init__.py", line 1994, in request
    cachekey,
  File "/usr/local/lib/python3.7/site-packages/httplib2/__init__.py", line 1651, in _request
    conn, request_uri, method, body, headers
  File "/usr/local/lib/python3.7/site-packages/httplib2/__init__.py", line 1557, in _conn_request
    conn.connect()
  File "/usr/local/lib/python3.7/site-packages/httplib2/__init__.py", line 1326, in connect
    self.sock = self._context.wrap_socket(sock, server_hostname=self.host)
  File "/usr/local/lib/python3.7/ssl.py", line 423, in wrap_socket
    session=session
  File "/usr/local/lib/python3.7/ssl.py", line 870, in _create
    self.do_handshake()
  File "/usr/local/lib/python3.7/ssl.py", line 1139, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self signed certificate (_ssl.c:1091)

I suspected this might be due to my key-cloack server is https and flask app is http and hence I have have modified the app.py to be https:

app.run(host='0.0.0.0', port=8000, debug=True, ssl_context='adhoc')

But even after making the flask app https, the issue remains the same.

Note since im running this application in containers , I have exposed the 8000 port to Nodeport i.e 30397 , hence the app url is : https://167.254.224.26:30397

from ssl.SSLCertVerificationError for flask application OAuth login with keycloak