expect_proxy_cidrs is used for dynamically determining whether proxy protocol should be used or not. On AWS the health check and regular traffic are forwarded with or without proxy protocol.
The idea of adding the expect-proxy directive CIDRs for AWS load balancer IP addresses as a "marker" for traffic that should become Proxy Protocol, while other traffic (including transparently proxied traffic) remains without Proxy Protocol.
By adding a new health endpoint, when expect_proxy_cidrs is set, the operator can select, which endpoint to use for checking the health of HAProxy.
expect_proxy_cidrsis used for dynamically determining whether proxy protocol should be used or not. On AWS the health check and regular traffic are forwarded with or without proxy protocol.The idea of adding the
expect-proxydirective CIDRs for AWS load balancer IP addresses as a "marker" for traffic that should become Proxy Protocol, while other traffic (including transparently proxied traffic) remains without Proxy Protocol.By adding a new health endpoint, when
expect_proxy_cidrsis set, the operator can select, which endpoint to use for checking the health of HAProxy.