@Override
  public void initializeNativeSession(Session session) {
    super.initializeNativeSession(session);

    this.id = ObjectUtils.getIdentityHexString(getNativeSession());
    this.uri = session.getUpgradeRequest().getRequestURI();

    this.headers = new HttpHeaders();
    this.headers.putAll(getNativeSession().getUpgradeRequest().getHeaders());
    this.headers = HttpHeaders.readOnlyHttpHeaders(headers);

    this.acceptedProtocol = session.getUpgradeResponse().getAcceptedSubProtocol();

    List<ExtensionConfig> source = getNativeSession().getUpgradeResponse().getExtensions();
    this.extensions = new ArrayList<WebSocketExtension>(source.size());
    for (ExtensionConfig ec : source) {
      this.extensions.add(new WebSocketExtension(ec.getName(), ec.getParameters()));
    }

    if (this.user == null) {
      this.user = session.getUpgradeRequest().getUserPrincipal();
    }
  }