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For Congestion due to frequency(many) access Are there any good apache module?

I wanna response 503 in the circumstance.

I've found

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It sounds like you've already answered your own question. – Andrew M. Dec 1 '10 at 4:42
yeah , it's little yes . But, I wanna get more solutions for comparition :-) – freddiefujiwra Dec 1 '10 at 9:42
up vote 2 down vote accepted

mod_security provides a lot of application firewalling functionality including DOS protection.

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