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The first layer of defense is a captcha page<ref>{{Cite web|url=https://support.google.com/recaptcha/answer/6081888?hl=en|title=My computer is sending automated queries – reCAPTCHA Help|website=support.google.com|language=en|accessdate=2017-04-02}}</ref> where the user is prompted to verify they are a real person and not a bot or tool. Solving the [[CAPTCHA|captcha]] will create a [[HTTP cookie|cookie]] that permits access to the search engine again for a while. After about one day, the captcha page is displayed again.
<ref>{{cite news |last1=Elbert |first1=Alex |title=Freelance SEO Singapore |url=https://freelanceseo.sg/ |access-date=26 July 2021}}</ref>
The second layer of defense is a similar error page but without captcha, in such a case the user is completely blocked from using the search engine until the temporary block is lifted, or the user changes their IP.
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