golang在页面显示getUsers

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package main

import (
   "database/sql"
   "fmt"
   _ "github.com/mattn/go-sqlite3"
   "log"
   "net/http"
)

// User is user
type User struct {
   ID   int
   Name string
}

func (user User) String() string {
   format := `ID : %d Name: %s`
   return fmt.Sprintf(format, user.ID, user.Name)
}
func sayHello(w http.ResponseWriter, r *http.Request) {
   fmt.Fprintf(w, "hello world!")
}
func GetUsers() string {
   db, err := sql.Open("sqlite3", "./foo.db")
   if err != nil {
       log.Fatal(err)
   }
   defer db.Close()

   rows, err := db.Query("select * from users")
   if err != nil {
       log.Fatal(err)
   }
   defer rows.Close()
   var id, name string
   users := ""
   for rows.Next() {
       err = rows.Scan(&id, &name)
       if err == nil {
           log.Println(id, name)
           users = users + id + "," + name + ";\n"
       }
   }
   return users
}
func getUsers(w http.ResponseWriter, r *http.Request) {
   fmt.Fprintf(w, GetUsers())
}
func main() {
   http.HandleFunc("/", sayHello)
   http.HandleFunc("/users", getUsers)
   err := http.ListenAndServe(":8880", nil)
   if err != nil {
       log.Fatal("ListenAndServe: ", err.Error())
   }
}