How are downed upstream servers detected as alive again?

[Bryon Roche]

On Wed, 23 Apr 2008 13:37:10 -0700, Rt Ibmer wrote:

See http://wiki.codemongers.com/NginxHttpUpstreamModule, documentation on 
the 'server' directive explains the conditions by which nginx downs a 
server. This also explains, in the writing about fail_timeout, how long 
nginx considers a failed upstream server down for.

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