Selenium 切换代理：每个会话还是每个标签页

# pip install -U selenium    and install gost (see gost.run)
import socket, subprocess, tempfile, time
from selenium import webdriver
from selenium.webdriver.common.by import By

PROXIES = [  # one entry per IP, copied from My assets (SOCKS5 endpoints)
    ("HOST", "PORT", "LOGIN_1", "PASSWORD_1"),
    ("HOST", "PORT", "LOGIN_2", "PASSWORD_2"),
]

def start_forwarder(local_port, host, port, login, password):
    proc = subprocess.Popen(["gost", "-L", f"socks5://127.0.0.1:{local_port}",
                             "-F", f"socks5://{login}:{password}@{host}:{port}"])
    for _ in range(50):
        try:
            socket.create_connection(("127.0.0.1", local_port), timeout=0.2).close()
            return proc
        except OSError:
            time.sleep(0.2)
    proc.terminate()
    raise RuntimeError("forwarder did not start")

def run_session(local_port, entry):
    forwarder = start_forwarder(local_port, *entry)
    options = webdriver.ChromeOptions()
    options.add_argument(f"--proxy-server=socks5://127.0.0.1:{local_port}")
    options.add_argument(f"--user-data-dir={tempfile.mkdtemp()}")   # a clean profile per session
    driver = webdriver.Chrome(options=options)                       # the proxy is fixed from here on
    try:
        driver.get("https://ipinfo.io/json")
        print(entry[2], driver.find_element(By.TAG_NAME, "body").text)
    finally:
        driver.quit()
        forwarder.terminate()

for i, entry in enumerate(PROXIES):
    run_session(1080 + i, entry)   # next proxy = next browser session

from selenium import webdriver
from selenium.webdriver.common.proxy import Proxy, ProxyType

proxy = Proxy()
proxy.proxy_type = ProxyType.MANUAL
proxy.socks_proxy = "127.0.0.1:1080"   # the local forwarder, no login in the address
proxy.socks_version = 5

options = webdriver.ChromeOptions()
options.proxy = proxy                  # set before the browser starts
driver = webdriver.Chrome(options=options)