Asana Python Api behind proxy server

Good Day everbody!
I have the problem, that I want to set up a Asana Bot from behind a proxy.
But i cant figure out how to enable the asana API with a proxy config. What i tried so far:

s.proxies = {
    "http": 'http://usr:pw@proxy',
    "https:": 'http://usr:pw@proxy'
}
client = asana.Client(session=s)
token = client.access_token(bot_token)
me = client.users.me()

Isn’t there a Script method that enables the python API to verify itself to the proxy server?

I also tried this:

http_proxy='http://http://usr:pw@proxy'
https_proxy='http://usr:pw@proxy'
python hello_asana.py

In a Terminal

Was due to misconfiguration of my Computer. There was a script active which sets Proxy configurations, needed to uncheck it.