go http middleware

handlerFuncWrapper.go

func errorHandler(fn http.HandleFunc) http.HandleFunc {
  return func(w http.ResponseWriter, r *http.Request) {
    defer func() {
      if e, of := recover().(os.Error); ok {
        w.WriteHeader(500)
        errorTemplate.Execute(w, e)
      }
    }()
    fn(w, r)
  }
}

func main() {
  http.HandleFunc("/", errorHandler(upload))
  http.ListenAndServe(":8080", nil)
}