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Does the user agent in any regular browser contain 'bot' or 'crawl'?

I check the user agent on my site to see if it is coming from a bot or not. If it is, I can do some little optimizations since they don't login. (I don't change the content at all)

After adding checks for 30-40+ bots, I'm getting tired of added them. So I was wondering if checking if it just contains 'bot' or 'crawl'. I know that wont get all bots, but it would get a lot of them. But if that could cause any false positives, then it would totally mess up the ability to add to cart, place an order, and login in.

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2 Answers

A better solution IMO would be to detect whether the user is logged in. If they are not, show the standard page (this could be cached). Any web spider will never be logged in but if you are optimizing for them, why not for new users to your site?

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This question from Stack Overflow should help: "Is there an online user agent database?"

You could quickly scan the db, and find out (or import it).

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