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What are some different ways/tools to verify that keep-alive is working on the server from the client's end?

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You could try 

ab -n 500 -c 5 -k http://www.domain.com/

and look via top, if 5 workers are constantly serving the requests keepalive should work (-k) switch. Do the same without -k and see the difference.

Cheers Izac

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that's what i wound up doing, though i read that curl can tell you this too. if it says "Connection #0 to host www.example.com left intact", it means keep-alive is on. – Ron Garrity Aug 26 '11 at 20:53
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