Introducing backend healthchecking plugin

[cep221]

> DISCLAIMER: Health-check module doesn't work for me at all 

To redeem the module, I checked over your config and it was missing the "Host:" header in your healthcheck_send.  Try using something similar to the sample config:

    healthcheck_send "GET /health HTTP/1.1" 'Host: www.ahost.com' 'Connection: close';

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,57810,61920#msg-61920