class WebAppProxyServlet extends HttpServlet {

  public WebAppProxyServlet() {
    super();
    conf = new YarnConfiguration();
    this.trackingUriPlugins =
        conf.getInstances(YarnConfiguration.YARN_TRACKING_URL_GENERATOR,
            TrackingUriPlugin.class);
    this.rmAppPageUrlBase = StringHelper.pjoin(
        WebAppUtils.getResolvedRMWebAppURLWithScheme(conf), "cluster", "app");
    this.ahsAppPageUrlBase = StringHelper.pjoin(
        WebAppUtils.getHttpSchemePrefix(conf) + WebAppUtils
        .getAHSWebAppURLWithoutScheme(conf), "applicationhistory", "apps");
  }

  public  WebAppProxyServlet();

}