Upstream max_fails, fail_timeout and proxy_read_timeout

[pliljenberg]

The requests before (for more than 30sec) to the server X are ok, this is
the diet request generating a 500 response (from the timeout).
Son up til this point all looks good - which is why I don't understand why
nginx considers the server inactive after the first fail :)

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,232912,232919#msg-232919