Just posting up a simple Python script that allows you to make API calls from behind a proxy that also requires authentication.

I have capitalised things that you need to customise.  Of course it isn’t good practice to have usernames and passwords in your script so this is just for illustrative purposes.

import requests
import base64

api_user = "YourApiUser"
api_pass = "YourApiPassword"
api_creds = api_user + ":" + api_pass


api_bytes = api_creds.encode("ascii")
api_encoded = base64.b64encode(api_bytes)
print(api_encoded)
api_string = api_encoded.decode("ascii")

proxies = {
        "http": "http://YourProxyUser:YourProxyPassword@ProxyServerIp:ProxyPort",
        "https": http://YourProxyUser:YourProxyPassword@ProxyServerIp:ProxyPort",
}

try:
    response = requests.get("https://fwd.app/api/networks", proxies=proxies, headers={"Authorization" : "Basic " + api_string})
    print(response.json())
except requests.exceptions.ProxyError as e:
    print("Proxy error:", e)