ext-check.cfg tests both for success and failure in two different backends.
--- /dev/null
+global
+ maxconn 500
+ external-check
+ stats socket /tmp/sock1 mode 666 level admin
+
+defaults
+ timeout client 5s
+ timeout server 5s
+ timeout connect 5s
+ mode http
+
+listen stats
+ bind :8888
+ stats uri /
+
+listen up
+ bind :8001
+ option external-check
+ external-check command /bin/true
+ server srv 127.0.0.1:8000 check inter 1000
+
+listen down
+ bind :8002
+ option external-check
+ external-check command /bin/false
+ server srv 127.0.0.1:8000 check inter 1000