Selenium proxy with username and password in Chrome

import json
import os
import subprocess
import time

from selenium import webdriver

USER = os.environ["PROXY_USER"]
PASS = os.environ["PROXY_PASS"]


def start_forwarder(targeting: str, port: int) -> subprocess.Popen:
    """A local proxy without a login that forwards to the gateway with one (pip install pproxy).
    Chrome talks to 127.0.0.1 and never has to answer a login prompt."""
    upstream = f"http://via.proxies.vision:9000#{USER}{targeting}:{PASS}"
    proc = subprocess.Popen(["pproxy", "-l", f"http://127.0.0.1:{port}", "-r", upstream])
    time.sleep(1)  # let it bind the port
    return proc


forwarder = start_forwarder("-country-de", 8899)
options = webdriver.ChromeOptions()
options.add_argument("--headless=new")
options.add_argument("--proxy-server=http://127.0.0.1:8899")
driver = webdriver.Chrome(options=options)
try:
    for _ in range(2):
        driver.get("https://ipinfo.io/json")
        data = json.loads(driver.find_element("tag name", "body").text)
        print(data["ip"], data["country"], data["org"])
finally:
    driver.quit()
    forwarder.terminate()