I'm trying to run my Python Selenium bot using undetected-chromedriver (imported as uc) in headless mode, but unfortunately, I can't get past Cloudflare's bot protection. Here's my current configuration code:

options = uc.ChromeOptions()
options.headless=True
options.add_argument("--window-size=1920,1080")
options.add_argument('--ignore-certificate-errors')
options.add_argument('--allow-running-insecure-content')
options.add_argument('--headless')
scrap = uc.Chrome(use_subprocess=True,options=options)

Answer #

Hey there, I’ve dealt with this exact headache a bunch of times—headless mode even with undetected-chromedriver can leave tiny fingerprints that Cloudflare’s systems pick up instantly. Let’s walk through some fixes that consistently work:

• Upgrade to Chrome’s new headless mode: The old --headless flag is basically a red flag for Cloudflare. Chrome 112+ introduced a far more undetectable headless mode that behaves nearly identical to a regular browser window. Swap out your headless settings like this:

  # Replace the old headless lines
  options.headless = False
  options.add_argument("--headless=new")
  

• Add realistic browser fingerprint arguments: Cloudflare checks for all sorts of small details to spot bots. Add these lines to mimic a real human’s browser:

  # Set a valid user agent (update to match your Chrome version)
  options.add_argument("--user-agent=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36")
  # Set language to match common user settings
  options.add_argument("--lang=en-US,en;q=0.9")
  # Disable automation flags that give bots away
  options.add_argument("--disable-blink-features=AutomationControlled")
  options.add_experimental_option("excludeSwitches", ["enable-automation"])
  options.add_experimental_option('useAutomationExtension', False)
  

• Slow down to human speed: Bots move way faster than people, and Cloudflare notices this. Add short delays between actions, or use explicit waits instead of fixed sleeps to wait for elements to load naturally:

  import time
  from selenium.webdriver.support.ui import WebDriverWait
  from selenium.webdriver.support import expected_conditions as EC
  from selenium.webdriver.common.by import By
  
  scrap.get("your-target-url.com")
  # Wait for Cloudflare's check to finish (adjust timeout as needed)
  WebDriverWait(scrap, 20).until(
      EC.presence_of_element_located((By.CSS_SELECTOR, "main"))  # Wait for your target page's main content
  )
  # Add a short delay before interacting
  time.sleep(1.5)
  

• Use a residential proxy: If your IP is being flagged (common with datacenter IPs), switch to a residential proxy—these come from real home networks, so Cloudflare is less likely to block them. Add it to your options like this:

  options.add_argument('--proxy-server=http://your-residential-proxy:port')
  

• Keep undetected-chromedriver updated: The maintainers are constantly pushing updates to bypass new Cloudflare detection methods. Run this command to make sure you’re on the latest version:

  pip install --upgrade undetected-chromedriver
  

Give these a try—combining the new headless mode with fingerprint tweaks usually does the trick for me. If you’re still stuck, sometimes adding a small scroll or random mouse movement can help sell the "human" act even more!

内容的提问来源于stack exchange，提问作者Osc4r