@Override
    public <T extends HttpUpgradeHandler> T upgrade(Class<T> handlerClass) throws IOException, ServletException {
        // TODO Servlet3.1 updates
        return null;
    }
@ Override public < T extends HttpUpgradeHandler > T upgrade ( Class < T > handlerClass ) throws IOException , ServletException { return null ; }
/*
(non-Javadoc)

@see javax.servlet.http.HttpServletRequest#upgrade(java.lang.Class)