Servlet's service and init method are being called, but not doGet while I am extending ZuulServlet

Before I start, I would say, I have already seen similar question Servlet's service and init method are being called, but not doGet but that dint help me much. Point to be noted here is that my servlet class extending com.netflix.zuul.http.ZuulServlet (which does routing for specific reason) and in service method I am calling super.service(servletRequest,servletResponse);.When I do http get call, I see my service() method is called but doGet() method is not called however in response I get a "HTTP/1.1 200 OK" without any body which is of course my doGet() method not sending. Below is my code snippet.

public class SpiderHealthServlet extends ZuulServlet {
@Override
public void init() throws ServletException {
    super.init();
    logger.info("SpiderHealthServlet called ");
    message = "pong";
}

@Override
public void service(ServletRequest servletRequest,
                    ServletResponse servletResponse) throws ServletException, IOException {
    logger.info("SpiderHealthServlet service called ");
    try {
        RequestContext.getCurrentContext().set("health", true);
        super.service(servletRequest,servletResponse);
    } finally {
        logger.info("SpiderHealthServlet service done ");
    }
}

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    super.doGet(req, resp);
    logger.info("SpiderHealthServlet doGet called ");
    // Set response content type
    resp.setContentType("text/html");
    PrintWriter out = resp.getWriter();
    out.println("<h1>" + message + "</h1>");
    resp.setStatus(HttpServletResponse.SC_OK);
}
}

Would be appreciated if anyone can help me to figure it out where I am doing mistake.