func testTransportGzip(t *testing.T, mode testMode) {
	if mode == http2Mode {
		t.Skip("https://go.dev/issue/56020")
	}
	const testString = "The test string aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
	const nRandBytes = 1024 * 1024
	ts := newClientServerTest(t, mode, HandlerFunc(func(rw ResponseWriter, req *Request) {
		if req.Method == "HEAD" {