t.Fatal("reading Body:", err)
	}
	if s := string(b); s != string(contents) {
		t.Errorf("for path %q got %q, want %q", filename, s, contents)
	}
	res.Body.Close()
}

func TestServeFileZippingResponseWriter(t *testing.T) {
	// This test exercises a pattern which is incorrect,
	// but has been observed enough in the world that we don't want to break it.
	//
	// The server is setting "Content-Encoding: gzip",