Playwright proxy errors: ERR_TUNNEL_CONNECTION_FAILED and the rest

import os

from playwright.sync_api import sync_playwright

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


def proxy(country: str = "", session: str = "") -> dict:
    """Playwright proxy settings: login in its own fields, never in server."""
    user = USER + (f"-country-{country}" if country else "")
    if session:
        # Sticky port: the same label keeps the same IP for 10 minutes.
        return {"server": "http://via.proxies.vision:10000", "username": f"{user}-session-{session}-lifetime-10", "password": PASS}
    return {"server": "http://via.proxies.vision:9000", "username": user, "password": PASS}


with sync_playwright() as p:
    # channel="chromium" reports proxy errors at once; the default headless
    # shell waited 30 seconds on a wrong password in our test.
    browser = p.chromium.launch(channel="chromium")

    # A new context = a new connection to the proxy = a new IP.
    for _ in range(2):
        context = browser.new_context(proxy=proxy("de"))
        page = context.new_page()
        page.goto("https://api.ipify.org")
        print("new context:", page.inner_text("body"))
        context.close()

    # One identity across contexts: the same session label.
    for _ in range(2):
        context = browser.new_context(proxy=proxy("de", session="account1"))
        page = context.new_page()
        page.goto("https://api.ipify.org")
        print("account1:", page.inner_text("body"))
        context.close()

    browser.close()