[Python] Python telegram bot via proxy with authentification

everyone.

I am trying to create a simple telegram bot. In my country telegram is blocked so I need to work via proxy.

from telegram.ext import Updater
from telegram.ext import CommandHandler

import os

def start(bot, update):
print("Hello")
bot.sendMessage(chat_id=512562849, text="Hello.")

REQUEST_KWARGS={
'proxy_url': 'http://93.171.217.48:10996',
'urllib3_proxy_kwargs': {
'username': '***',
'password': '***',
}
}


updater = Updater(token='<BOT_TOKEN>',
request_kwargs=REQUEST_KWARGS)


start_handler = CommandHandler('start', start)

updater.dispatcher.add_handler(start_handler)
updater.start_polling()


But I have the next log

Exception in thread updater:
...
_HTTPConnection.__init__(self, *args, **kw)
TypeError: __init__() got an unexpected keyword argument 'username'


I used the next docs.

The free proxy works ok, but for my goals, it's bad to lose connection time after time. I prefer not to work under VPN either because of some bureaucracy in my company.

Thanks in advance!

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