tcp流量转发到不同的后端

想把流量发个多个后端，每个后端都可以收到内容，但我写的，每次都只有一个后端收到内容，随机的 ``` package main import ( "flag" "fmt" "io" "net" "strings" ) var tcp_conn []net.Conn func main() { var address *string var dst *string address = flag.String("listen_address", "127.0.0.1:8080", "listen address") dst = flag.String("target_address", "172.16.5.9:18061,172.16.5.9:18060", "目标地址,多个地址逗号分割") flag.Parse() listener, err := net.Listen("tcp", *address) if err != nil { fmt.Println(err) } ips := strings.Split(*dst, ",") if len(ips) == 0 { fmt.Println("目标地址不能为空") return } for _, ip := range ips { conn, err := net.Dial("tcp", ip) if err != nil { fmt.Println(err) continue } tcp_conn = append(tcp_conn, conn) } for { conn, err := listener.Accept() if err != nil { continue } go handler(conn) } } func handler(conn net.Conn) { // defer conn.Close() for _, dst_conn := range tcp_conn { go io.Copy(dst_conn, conn) go io.Copy(conn, dst_conn) } } ``` 该如何改呢，哪位大佬帮忙看看