Why might the crawler need to simulate browser access, and how is it done?

If expireddomains.net implements anti-crawling measures, the script can add HTTP headers like `User-Agent` to mimic a real browser. The [article](/news/penetration-basics-choosing-a-suitable-c2-domain) demonstrates adding `req.add_header("User-Agent", "Mozilla/5.0...")` to bypass such restrictions, though currently the site does not block automated queries.