Adding Custom Data to Response Headers?

[Saiprasad Natarajan]

Hi

If i add a custom header to the HttpServletResponse object, like say,

response.addHeader("MyNewHeader","MyNewValue");

and then do a response.SendRedirect(URL) to some other URL, will i be able to read this header value at that app?

I've tried this with 2 dummy servlets in different apps but doesn't seem to be working. Am i getting something wrong here or am i trying something which is not right?

At the redirected URL, i retrieve the headers using request.getHeader(headerName);

TIA

[Ravi Kiran Va]

I have tried this sample Program :

public class Test extends HttpServlet {
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
	{
			response.setContentType("text/html");
			PrintWriter out = response.getWriter();
			response.setHeader("Cache-Control", "no-cache");
			response.setHeader("Allow","POST");
			response.setHeader("Ravi", "Kiran");
			out.println("Hai Welcome to 2011");

}
}

I have used JMeter tool to observe the Response Data from the Servlet See the screen shot attached )
What i want to say is , It works the custom response headers will also be added .

[Ulf Dittmer]

and then do a response.SendRedirect(URL) to some other URL, will i be able to read this header value at that app?

No. The response headers are read by the client and then discarded. (Besides, they're response headers, and thus not part of a request.) You'll need to put any data you want to reach the final destination as URL parameters.

Ravi Kiran Va wrote:...

There's no redirection here, so the example is not relevant.

[Saiprasad Natarajan]

Thanks for the reply.

I am passing the data using query parameters but i was just wondering if there is a way to differentiate between a redirect and when someone accesses the app from the address bar directly.


Thanks

[Ravi Kiran Va]

Thanks ulf for the relavant answer . (There should be some clapping Icon on the Icons List )