Just to make things more interesting, I'd suggest you take a look at even based approach, for example, via POE (POE::Component::Client::HTTP) or the like.
But I'd suggest that you keep this in the back of your head, and leave it for future, because it requires that you think about I/O, order of things, blah blah blah.
It was pretty hard for me personally to write a web crawler like that.
But anyway, it *is* possible to increase the performance of fetching websites to about 10K ~ 20K urls/hour using such an approach. And this is with a single process.
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