Наконец изменил конфигурацию как ниже. Нужен бэкэнд RB0-web roundrobin способом.
listen FrontEnd IP:80
mode http
log global
acl is_web path -i /
acl is_web1 path -i /1
acl is_web2 path -i /2
acl is_report path -i /report
use_backend B1-web if is_web1
use_backend B2-web if is_web2
use_backend RB0-web if is_web
use_backend B-Report if is_report
backend B1-web
mode http
redirect code 301 location https://FQDN/web/ws/login/ulogin
backend B2-web
mode http
redirect code 301 location https://FQDN:8443/web/ws/login/ulogin
backend RB0-web
mode http
balance roundrobin
option forwardfor
redirect code 301 location https://FQDN:8443/web/ws/login/ulogin
redirect code 301 location https://FQDN/web/ws/login/ulogin
backend B-Report
mode http
balance roundrobin
option forwardfor
redirect code 301 location https://FQDN:8080/jasperserver/login.html