how to use rsync's proxy protocol and haproxy together

[Firebasky]

I want to know how to use rsync's proxy protocol and haproxy together? Can you give me a demo?

look. error.

haproxy.cfg

global
    log 127.0.0.1 local2
    ulimit-n 800000
    chroot /var/lib/haproxy
    pidfile /var/run/haproxy.pid
    maxconn 4000
    user haproxy
    group haproxy
    daemon
    stats socket /var/lib/haproxy/stats

defaults
    mode tcp                    # 配置 tcp 模式
    log global
    option dontlognull
    retries 3
    maxconn 6000
    timeout queue 1m
    timeout connect 1000s
    timeout client 150000m
    timeout server 150000m
    timeout check 10s

frontend forward8080
    bind *:8080                  # 代理服务监听 8080 端口
    default_backend server6000

backend server6000
                                 # 后端业务服务监控 6000 端口
    server server1  127.0.0.1:873 send-proxy maxconn 3000    # v1 版本
    #server server1 127.0.0.1:6000 send-proxy-v2 maxconn 3000  # v2 版本