How to set and retrieve the http headers

Question

I am adding one custom header "edmsversion" in my first page, it is visible in it but when the response is redirected to another jsp, my header is lost. In second page, it's not getting. I have copied my code below. Please help me.
My first Page
     System.out.println("Jsp called successfully");
     response.addHeader("edmsversion","1.2");
     boolean isheader = response.containsHeader("edmsversion");
     System.out.println("contains edmsversion header ..."+isheader);
     response.sendRedirect("/TestHeaderResponse.jsp");
TestHeaderResponse.jsp
     System.out.println("Test header response page called successfully");
     String stringversion = request.getHeader("edmsversion");
     out.println("edms version header : "+stringversion);
     Enumeration headernames = request.getHeaderNames();
     System.out.println("Headers---------");
     while (headernames.hasMoreElements()){
          String headername = (String)headernames.nextElement();
          String headervalue = request.getHeader(headername);
          System.out.println(headername+"----"+headervalue);
     out.println("over");     

Answer 1

You are setting a response header, then telling the browser to make a new request to a different page. All headers sent from "My First Page" are discarded and only the new response headers from "TestHeaderResponse.jsp" are available to the browser.
Try using
getServletContext().getRequestDispatcher("/TestHeaderResponse.jsp").include();That should work I would think. You cannot use the forward() method of the requestDispatcher because you cannot have sent any output from the calling servlet when using forward(). If forwarding from a jsp, all data in the output buffer is cleared before the forward takes place I believe, so you would get the same problem. Hope that helps.