return
		}
		w.Header().Set("Content-Type", "text/plain; charset=UTF-8")
		w.Write(data)

	case strings.HasPrefix(r.URL.Path, "/tile/"):
		t, err := tlog.ParseTilePath(r.URL.Path[1:])
		if err != nil {
			http.Error(w, "invalid tile syntax", http.StatusBadRequest)
			return
		}
		if t.L == -1 {
			// Record data.
			start := t.N << uint(t.H)