Rebrowser Patches Not Effectively Bypassing Bot Detection

[Antonio-Margheriti]

I have been attempting to use Rebrowser patches with both the npm and Python packages, using the patched version directly. Below is the Python script I am using to launch the browser and connect via CDP:

from rebrowser_playwright.sync_api import sync_playwright
with sync_playwright() as playwright:
     # Create persistent context with custom options
     context = playwright.chromium.launch_persistent_context(
         user_data_dir='',
         headless=False,  # Required for `--headless=new`
         ignore_default_args=["--disable-extensions"],
         viewport={"width": 1440, "height": 900},
         screen={"width": 1440, "height": 900},
         args=['--headless=new',
                '--disable-blink-features=AutomationControlled',
                '--disable-software-rasterizer',
                '--ignore-gpu-blocklist',
                '-enable-webgl',
                '--enable-features=WebRTC-H264WithOpenH264FFmpeg,WebGL2ComputeRendering',
                '--disable-background-timer-throttling',
                '--disable-renderer-backgrounding',
                '--no-sandbox',
                '--disable-gpu',
                '--remote-allow-origins=*',
                '--remote-debugging-address=0.0.0.0',
                '--remote-debugging-port=9222',
                '--disable-dev-shm-usage'],
     )
     try:
             # Keep the browser running indefinitely
             while True:
                 time.sleep(1)  # Sleep to prevent high CPU usage
     except KeyboardInterrupt:
         print("\nClosing the browser...")

I have experimented with various argument combinations, but regardless of the setup, I encounter the same issue. Specifically, when I navigate to https://bot-detector.rebrowser.net/ and take a screenshot through Playwright, I consistently receive the following detection result:

Steps to Reproduce

Use rebrowser_playwright of version 1.49.1.
Use the provided script to launch a persistent Chromium context with Rebrowser patches.
Navigate to https://bot-detector.rebrowser.net/ via CDP, using something like this:

const { chromium } = require('playwright');
const fs = require('fs');

const browser = await chromium.connectOverCDP("http://localhost:9222");
const context = browser.contexts()[0];
const page = context.pages()[0];
await page.goto("https://bot-detector.rebrowser.net/");
const screenshotBuffer = await page.screenshot();
fs.writeFileSync('screenshot.png', screenshotBuffer);

In this specific case Im using Python 3.12.7, however this reproduces in node as well.

I would appreciate any guidance on what might be missing in my setup or any configuration changes required to address this issue.

Thank you in advance for your assistance!

[nwebson]

Could you please share the code how you could reproduce it in node?
It looks like it doesn't actually use the patched files for some reason.

[Antonio-Margheriti]

Of course! I wanted to isolate the problem as much as possible and not to confuse it with this.
This is my code snippet:

let { chromium } = require('rebrowser-playwright');
const fs = require('fs');

(async () => {
  try {
    const context = await chromium.launchPersistentContext('', {
      headless: false,
      ignoreDefaultArgs: ["--disable-extensions"],
      args: [
        '--headless=new',
        '--disable-blink-features=AutomationControlled',
        '--disable-software-rasterizer',
        '--ignore-gpu-blocklist',
        '-enable-webgl',
        '--enable-features=WebRTC-H264WithOpenH264FFmpeg,WebGL2ComputeRendering',
        '--disable-background-timer-throttling',
        '--disable-renderer-backgrounding',
        '--no-sandbox',
        '--disable-gpu',
        '--remote-allow-origins=*',
        '--remote-debugging-address=0.0.0.0',
        '--remote-debugging-port=9222',
        '--disable-dev-shm-usage',
      ]
    });
    const page = context.pages()[0];
    await page.goto('https://bot-detector.rebrowser.net/');
    await new Promise(r => setTimeout(r, 2000));
    const screenshotBuffer = await page.screenshot();
    fs.writeFileSync('screenshot.png', screenshotBuffer);
    // process.exit(0);
  } catch (error) {
    console.error('Error launching browser:', error);
    process.exit(1);
  }
})();

Interestingly, without the sleep I actually get this:

However, if I do wait I still get this:

Upon further inspection it turns out that the node code is actually working well and it was indeed this issue after all :)
I have no idea what causes the python version to not work, but you can regard this as closed :)