Golang script won't run on Raspberry?

Question

go

Installed on raspberry GO scripts like

package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
}

work fine, but the template script with the web server hangs without errors.

package main

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

func main()  {
  http.HandleFunc("/",page)
  port := ":8080"
  fmt.Println("server start/ port:",port)
  err := http.ListenAndServe(port,nil)
  if err != nil {
    log.Fatal("ListenAndServe",err)
  }
}
func page(w http.ResponseWriter, r *http.Request)  {
  fmt.Println("open Main")
}

PS I run from the console like this "go run server.go"