此示例文件在haproxy1.8.20 测试没有问题：
global
log 127.0.0.1 local0 info
maxconn 4096
user nobody
group nobody
daemon
nbproc 1
pidfile /usr/local/haproxy/logs/haproxy.pid
defaults
mode http
retries 3
timeout connect 10s
timeout client 20s
timeout server 30s
timeout check 5s
frontend www
bind *:80
mode http
option httplog
option forwardfor
option httpclose
log global
#acl host_www hdr_dom(host) -i www.zb.com
#acl host_img hdr_dom(host) -i img.zb.com
#use_backend htmpool if host_www
#use_backend imgpool if host_img
default_backend htmpool
backend htmpool
mode http
option redispatch
option abortonclose
balance static-rr
cookie SESSION_COOKIE insert indirect nocache
option httpchk GET /index.jsp
server 237server 192.168.81.237:8080 cookie server1 weight 6 check inter 2000 rise 2 fall 3
server iivey234 192.168.81.234:8080 cookie server2 weight 3 check inter 2000 rise 2 fall 3
backend imgpool
mode http
option redispatch
option abortonclose
balance static-rr
cookie SERVERID
option httpchk GET /index.jsp
server host236 192.168.81.236:8080 cookie server1 weight 6 check inter 2000 rise 2 fall 3
listen admin_stats
bind 0.0.0.0:9188
mode http
log 127.0.0.1 local0 err
stats refresh 30s
stats uri /haproxy-status
stats realm welcome login\ Haproxy
stats auth admin:admin~!@
stats hide-version
stats admin if