}
	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)
	if got, want := string(body), content; got != want {
		t.Errorf("got response %q, want %q", got, want)
	}
}

func Test1xxHeadersNotModifiedAfterRoundTrip(t *testing.T) {
	// https://go.dev/issue/65123: We use httptrace.Got1xxResponse to capture 1xx responses
	// and proxy them. httptrace handlers can execute after RoundTrip returns, in particular