Trouble logging in behind a proxy server

So, I am behind an authenticated proxy server.
When I run the following python script,


#! /usr/bin/python3.5

from kiteconnect import KiteConnect

kite = KiteConnect(api_key="xxx")

try:
user = kite.request_access_token(request_token="yyy",secret="zzz")
kite.set_access_token(user["access_token"])
except Exception as e:
print("Authentication failed", str(e))
raise

print(user["user_id"], "has logged in")

print(kite.positions())

order_id = kite.order_place(
tradingsymbol="INFY",
exchange="NSE",
quantity=1,
transaction_type="BUY",
order_type="MARKET"
)

I get errors. The full stacktrace is:


Authentication failed Gateway connection error
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 555, in urlopen
self._prepare_proxy(conn)
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 753, in _prepare_proxy
conn.connect()
File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 230, in connect
self._tunnel()
File "/usr/lib/python3.5/http/client.py", line 832, in _tunnel
message.strip()))
OSError: Tunnel connection failed: 407 Proxy Authentication Required

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/requests/adapters.py", line 376, in send
timeout=timeout
File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 610, in urlopen
_stacktrace=sys.exc_info()[2])
File "/usr/lib/python3/dist-packages/urllib3/util/retry.py", line 273, in increment
raise MaxRetryError(_pool, url, error or ResponseError(cause))
requests.packages.urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='api.kite.trade', port=443): Max retries exceeded with url: /session/token (Caused by ProxyError('Cannot connect to proxy.', OSError('Tunnel connection failed: 407 Proxy Authentication Required',)))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/kiteconnect/__init__.py", line 494, in _request
timeout=self._timeout)
File "/usr/lib/python3/dist-packages/requests/api.py", line 53, in request
return session.request(method=method, url=url, **kwargs)
File "/usr/lib/python3/dist-packages/requests/sessions.py", line 468, in request
resp = self.send(prep, **send_kwargs)
File "/usr/lib/python3/dist-packages/requests/sessions.py", line 576, in send
r = adapter.send(request, **kwargs)
File "/usr/lib/python3/dist-packages/requests/adapters.py", line 437, in send
raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='api.kite.trade', port=443): Max retries exceeded with url: /session/token (Caused by ProxyError('Cannot connect to proxy.', OSError('Tunnel connection failed: 407 Proxy Authentication Required',)))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "./kite.py", line 11, in <module>
user = kite.request_access_token(request_token="v5vy474hp416qbhw32zhebvkrth2er81",secret="pipnm9z3lnlvssp2a3z8oxndzde0e87z")
File "/usr/local/lib/python3.5/dist-packages/kiteconnect/__init__.py", line 215, in request_access_token
"checksum": checksum
File "/usr/local/lib/python3.5/dist-packages/kiteconnect/__init__.py", line 446, in _post
return self._request(route, "POST", params)
File "/usr/local/lib/python3.5/dist-packages/kiteconnect/__init__.py", line 496, in _request
raise ex.ClientNetworkException("Gateway connection error", code=503)
kiteconnect.exceptions.ClientNetworkException: Gateway connection error

Everything else is correct, api key, secret key, request token etc. It's just that I don't know how to force use of proxy with official python client.How to make this script (official python client) to use proxy while connecting to the Kite Connect server?

Thanks!!