HAProxy - turn off client ssl verification

I would like to turn off client ssl verification as part of HAProxy config.
I tried a few settings including this inside global but did not help

ssl-server-verify none

Excerpt from rancher config

pslb:
  scale: 1
  load_balancer_config:
    haproxy_config:
      global: ssl-server-verify none
  default_cert: mycert
  health_check:
    port: 42
    interval: 2000
    unhealthy_threshold: 3
    healthy_threshold: 2
    response_timeout: 2000

for anyone else encountering this in a pre-1.2 release, see: