Documentation.

curl -x http://USERNAME:[email protected]:8080 \
  https://api.ipify.org

import requests

proxy = "http://USERNAME:[email protected]:8080"
r = requests.get("https://api.ipify.org",
                 proxies={"http": proxy, "https": proxy})
print(r.text)

import { fetch, ProxyAgent } from "undici";

const proxy = new ProxyAgent("http://USERNAME:[email protected]:8080");
const res = await fetch("https://api.ipify.org", { dispatcher: proxy });
console.log(await res.text());