CDP Browser Control: Driving Real Chromium from Python

Playwright and Selenium are great until you hit bot detection. Google OAuth, Cloudflare, and Vercel checkpoints all flag headless browsers. Here's how to control a real Chromium instance via CDP using Python and websockets.

Why Not Playwright?

Playwright launches a headless browser with automation flags. Even in headed mode with Xvfb, Google detects it.

The CDP Approach

Launch Chromium with remote debugging:

chromium-browser --user-data-dir=/path/to/profile --remote-debugging-port=9222 --no-first-run

Connect via WebSocket in Python:

import asyncio, json, websockets, urllib.request

async def get_page_ws():
    resp = urllib.request.urlopen('http://localhost:9222/json')
    targets = json.loads(resp.read())
    for t in targets:
        if t['type'] == 'page':
            return t['webSocketDebuggerUrl']

async def cdp_call(ws, method, params=None):
    msg_id = cdp_call.id = getattr(cdp_call, 'id', 0) + 1
    msg = {'id': msg_id, 'method': method}
    if params: msg['params'] = params
    await ws.send(json.dumps(msg))
    while True:
        resp = json.loads(await ws.recv())
        if resp.get('id') == msg_id: return resp

Key Advantages

1. Real browser fingerprint, no automation flags
2. Persistent sessions, cookies survive across runs
3. Google OAuth works, existing sessions carry over
4. No bot detection, it IS a real browser

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