go http.ListenAndServe 不等待连接看起来像是退出

package main

import (
        "fmt"
        "log"
        "net/http"
)

func main() {
        fmt.Println("Start Server")
        log.Print("Start Server")
        http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
                fmt.Fprintln(w, "Hello, World! from linux")
        })
        log.Print("Going to listen")
        if err := http.ListenAndServe(":80", nil); err != err {
          log.Print("getting error")
          log.Fatal(err)
        }
        fmt.Println("End  Server")
        log.Print("End  Server")
}

xxx@xxx:~/go_test$ CGO_ENABLED=0 go build -gcflags "all=-N -l" -o ./main
    umen@umen:~/go_test$ ./main
Start Server
2023/11/15 07:40:22 Start Server
2023/11/15 07:40:22 Going to listen
End  Server
2023/11/15 07:40:22 End  Server

xxx@xxx:~$ curl http://localhost
curl: (7) Failed to connect to localhost port 80 after 0 ms: Connection refused