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Well, I've worked for organizations that had active defenses against crawlers... Make too many HTTP request and hour and ~poof~ a deny directive goes in the .htaccess file, or if they really like to play a rough game they'll firewall you.

I know delicious had active defenses because I ran afoul of them.



And really, slowing your connections down to rates that are measured in baud would be the most fun.


True, there are plenty of relatively cheap proxy services made for exactly this reason though that will roll your IP on each request.




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