Playwright per-context proxies in Python — one browser, many countries https://quanticdata.io/blog/how-to-use-playwright-for-scraping/

qd_playwright_proxy.py

"""One Playwright browser, a different country per context.

    pip install playwright && playwright install chromium
    export QD_PROXY_USER=... QD_PROXY_PASS=...
    python3 qd_playwright_proxy.py

Two things worth knowing:

1. Setting the proxy on the CONTEXT rather than the browser means one browser process
   can hold several exits at once. Launching a browser per country is the expensive
   mistake people make here.
2. A proxy hides the exit IP, not the browser. WebRTC can still leak the real local
   address, so the args below disable it.

https://quanticdata.io/residential-proxies/
Guides: https://quanticdata.io/blog/how-to-use-playwright-for-scraping/
        https://quanticdata.io/blog/playwright-stealth-in-python/
"""
import os

from playwright.sync_api import sync_playwright

GATEWAY = "http://pr.quanticdata.io:7777"
USER = os.environ["QD_PROXY_USER"]
PASS = os.environ["QD_PROXY_PASS"]
COUNTRIES = ["us", "gb", "de", "jp"]

with sync_playwright() as p:
    browser = p.chromium.launch(args=[
        "--disable-features=WebRtcHideLocalIpsWithMdns",
        "--force-webrtc-ip-handling-policy=disable_non_proxied_udp",
    ])

    for country in COUNTRIES:
        context = browser.new_context(
            proxy={
                "server": GATEWAY,
                # Targeting goes in the username, exactly as with curl or requests.
                "username": f"{USER}-country-{country}",
                "password": PASS,
            },
            locale={"us": "en-US", "gb": "en-GB", "de": "de-DE", "jp": "ja-JP"}[country],
        )
        page = context.new_page()
        page.goto("https://ipinfo.io/json", wait_until="domcontentloaded")
        print(f"{country}: {page.inner_text('body')[:120]}")
        context.close()

    browser.close()