id_user
phone_number

type User struct{
     IDUser int `json:id_user`
     PhoneNumber string `json:phone_number`
}

func User(w http.ResponseWriter, r *http.Request){
  var decoder = schema.NewDecoder()
  var user User
  if err := r.ParseForm(); err != nil {
     fmt.Println(err)
  }

  err := decoder.Decode(&user, r.PostForm)
  if err != nil {
     fmt.Println(err)
  }
  respBody, err := json.Marshal(user)
  w.Header().Set("Content-Type", "application/json")
  w.WriteHeader(http.StatusOK)
  w.Write(respBody)
}