Headless Browser Blocked by Cloudflare? What Works (2026)

Cloudflare blocks stock headless Chrome because it signals automation (navigator.webdriver is true, Playwright's headless shell sends HeadlessChrome in its user agent), often runs from cloud server IPs, and starts each run without cookies. The article recommends getting recognized via an official API or Web Bot Auth verification, or, on sites you're allowed to automate, using a real Chromium with residential IPs and a persistent profile, which in practice means a managed stealth browser. It cites Stealth Bench V2 (September 25, 2026) results where headless Chrome with no proxy got through 3% of visits versus 90.5% for Browser Use Cloud, noting the site set favors the vendor.