Error Adapter - Go

error_adapter.go

func errorAdapter(f func(http.ResponseWriter, *http.Request) error) http.HandlerFunc {
        return func(w http.ResponseWriter, r *http.Request) {
                c := appengine.NewContext(r)
                err := f(w, r)
                if err != nil {
                        c.Errorf("Handler returned an error: %s", err)
                        http.Error(w, err.Error(), http.StatusInternalServerError)
                }
        }
}