What prevents them from simultaneously acquiring a dozen session IDs each from a different IP (via an anonymous proxy or something of the sort) though? Implementing this will complicate your code without particularly hindering the harvester.

Makeshifts last the longest.

In reply to Re^3: State-of-the-art in Harvester Blocking by Aristotle
in thread State-of-the-art in Harvester Blocking by sgifford

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