Common Anti-Scraping Techniques
Websites employ various techniques to detect and block scrapers. Understanding these helps you build more resilient scrapers.
Why Sites Block Scrapers
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User-Agent Detection
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Rate Limiting
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IP Blocking
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CAPTCHA
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JavaScript Challenges
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Browser Fingerprinting
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Honeypot Traps
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Request Pattern Analysis
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Common Protections Summary
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Key Takeaways
- Websites block scrapers to protect resources and data
- User-Agent and rate limits are the first line of defense
- IP blocking requires proxy rotation
- CAPTCHAs may require external solving services
- JavaScript challenges need browser automation
- Browser fingerprinting detects headless browsers
- Honeypots catch bots that follow hidden links
- Mimic human behavior patterns to avoid detection
- Start with the simplest solution and add complexity as needed