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Browser fingerprinting is a method websites use to identify browser sessions based on signals such as device, browser, screen size, language, timezone, cookies, and behavior. These signals can affect whether a task loads normally, triggers a challenge, or gets blocked. Octoparse uses browser-based extraction, so browser behavior and environment settings can influence task stability.

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What websites may check

Websites may evaluate:
  • Browser type and version
  • User agent
  • Cookies and session state
  • Language and timezone
  • Screen size or viewport
  • IP address and location
  • Loading behavior
  • Interaction timing
  • Repeated request patterns

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Why it matters

Fingerprinting can cause tasks to behave differently across environments.
SituationPossible explanation
Works locally but fails in cloudWebsite treats the cloud environment differently
Login expires unexpectedlySession or cookie signals changed
CAPTCHA appears during runsWebsite detected unusual browser or traffic behavior
Content differs by runLocation, language, or session state changed
Page loads incomplete contentBrowser or environment signals affect page behavior
1

Test locally first

Observe how the website behaves in the built-in browser.
2

Stabilize login and cookies

Use consistent login and cookie settings for session-dependent pages.
3

Control location when needed

Use proxies if the website serves different content by region or IP.
4

Avoid aggressive runs

Add waits and avoid excessive frequency that looks unnatural.
5

Compare logs

Compare local and cloud run behavior using logs when failures appear only in one environment.

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Best practices

  • Keep task behavior close to normal browsing patterns.
  • Add waits for dynamic content.
  • Avoid unnecessary repeated page reloads.
  • Use stable sessions for login-required sites.
  • Use proxies only when they solve a clear access or location issue.
  • Re-test tasks after major website changes.
Browser fingerprinting is controlled by the target website. Octoparse can help you configure more stable workflows, but it cannot guarantee that every website will allow automated extraction.