How Can I Prevent Selenium Detection by Modifying the `navigator.webdriver` Flag in Chrome?

Modifying navigator.webdriver Flag to Prevent Selenium Detection in Chrome

WebDriver-driven automation often faces detection, with websites employing measures to identify controlled browsers. To prevent this detection, Selenium offers a method to modify the navigator.webdriver flag in Chrome.

1. execute_cdp_cmd() Update

With the introduction of execute_cdp_cmd(), you can execute Google Chrome DevTools commands using Selenium. This empowers you to easily alter the navigator.webdriver flag.

2. Preventing Selenium Detection

To prevent Selenium detection, consider the following approaches:

• Add the argument '--disable-blink-features=AutomationControlled'
• Rotate the user agent using execute_cdp_cmd()
• Set the navigator.webdriver property to undefined
• Exclude the collection of enable-automation switches
• Turn off useAutomationExtension

3. Sample Code

Combining these methods, an effective Selenium code snippet would be:

from selenium import webdriver

options = webdriver.ChromeOptions()
options.add_argument("start-maximized")
options.add_experimental_option("excludeSwitches", ["enable-automation"])
options.add_experimental_option('useAutomationExtension', False)
driver = webdriver.Chrome(options=options, executable_path=r'C:\WebDrivers\chromedriver.exe')
driver.execute_script("Object.defineProperty(navigator, 'webdriver', {get: () => undefined})")
driver.execute_cdp_cmd('Network.setUserAgentOverride', {"userAgent": 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.53 Safari/537.36'})
print(driver.execute_script("return navigator.userAgent;"))
driver.get('https://www.httpbin.org/headers')

4. Background and Caution

As per the W3C Editor's Draft, the navigator.webdriver flag indicates remote control of the user agent. It is essential to exercise caution, as modifying these parameters may block navigation and highlight the WebDriver instance.

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