void readClientRedirect(int x, int y, int w, int h) {
    int port = is.readU16();
    String host = is.readString();
    String x509subject = is.readString();

    if (x != 0 || y != 0 || w != 0 || h != 0) {
      vlog.error("Ignoring ClientRedirect rect with non-zero position/size");
    } else {
      handler.clientRedirect(port, host, x509subject);
    }
  }