Is there any way in web development to ensure that web crawlers cannot crawl your website?
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Is there any way in web development to ensure that web crawlers cannot crawl your website?
Ensure? No.
You can ask politely with robots.txt (but they can be ignored), you can stick up barriers with CAPTCHA (but they can be defeated and impose a barrier to ordinary users), and you can monitor the behaviour of each visitor looking for bot patterns (but bots can proxy cycle and rate limit).