HAProxy nbsrv seems to give wrong value

I'm not entirely sure if the following will work for you, and can't test right now, but maybe it's helpful, still:

HAProxy config of dc01:

defaults 
  mode http 

frontend front_www
  listen 0.0.0.0:80 

  acl acl_backend_down nbsrv(back_www) lt 1 

  monitor-uri /health
  monitor fail if acl_backend_down

  use_backend dc02 if acl_backend_down
  default_backend back_www

backend back_wwww
  server s1 1.2.3.1:80 check 
  server s2 1.2.3.2:80 check

backend dc02
  server haproxy-dc2 1.3.4.1:80 check

Leverage the monitor-uri and monitor fail directives and check /health from dc02 (and vice versa). /health should report HTTP 200 if at least one backend is alive and healthy, otherwise HTTP 503.

HAProxy nbsrv seems to give wrong value

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