// ErrHijacked is returned by ResponseWriter.Write calls when
	// the underlying connection has been hijacked using the
	// Hijacker interface. A zero-byte write on a hijacked
	// connection will return ErrHijacked without any other side
	// effects.
	ErrHijacked = errors.New("http: connection has been hijacked")

		conn, _, err := w.(Hijacker).Hijack()
		if err != nil {
			t.Errorf("Hijack: %v", err)
			return
		}
		defer conn.Close()
		_, err = w.Write(nil)
		if err != ErrHijacked {
			t.Errorf("Write error = %v; want ErrHijacked", err)
		}
	}), func(ts *httptest.Server) {
		ts.Config.ErrorLog = log.New(terrorWriter{t}, "Unexpected write: ", 0)
	}).ts

	c := ts.Client()
	res, err := c.Get(ts.URL)