Why does my scraper keep getting blocked on target sites?

Your scraper is probably getting blocked because target sites see it as unusual or abusive traffic. Common reasons include:

• Too many requests too fast: high request rates, bursts, or no delays.
• Predictable patterns: scraping pages in a perfectly sequential way or hitting the same endpoints repeatedly.
• Missing browser-like headers: no User-Agent, Accept-Language, Referer, etc.
• No cookies / session behavior: real browsers typically carry state; simple scripts often don’t.
• IP reputation issues: datacenter/VPN/proxy IPs are easier to flag than residential connections.
• Bot detection systems: sites use JavaScript checks, CAPTCHAs, fingerprinting, or behavior analysis.
• Ignoring robots/policies: some sites actively throttle or block automated access.
• Authentication limits: expired tokens, rate-limited APIs, or access tied to logged-in behavior.

What to do:

• Reduce request rate and add jittered delays.
• Use a polite concurrency limit.
• Reuse sessions/cookies.
• Make headers consistent with a normal browser.
• Cache results and avoid refetching the same pages.
• Respect robots.txt, terms, and API limits.
• If available, use an official API instead of scraping.

If you want, I can help you debug it more specifically. Paste:

1. the target site behavior (e.g. 403, 429, CAPTCHA, blank pages),
2. a sample request, and
3. your scraper stack (requests, Playwright, Selenium, etc.).