HAProxy Enterprise Documentation 1.8r2
Variables
You can set and unset custom variables for HTTP and TCP health checks.
Set check.port
for use in the HTTP check:
http-check set-var(check.port) int(1234)
Unset the check.port
variable in the HTTP check:
http-check unset-var(check.port)
For complete details, see:
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Passive Health Checks