There are three ways to redirect servlet request.
res.sendRedirect(url) - 
//No opening of any streams!!! Before 
res.sendRedirect( query );
// No opening of any streams!! After (not even System.out.println(x);
// You cannot alter the URI!! Use the thrid method….

open Socket to host and port and talk the HTTP protocol - 
/**
 * This method was created in VisualAge.
 * @param url java.lang.String
 */
public void redirect(HttpServletResponse res, String url) {
	String host = "141.176.4.9";
	int port = 80;
	String request = "GET / \n";
	String line="";
	try {
		java.net.Socket s = new java.net.Socket(host, port);
		java.io.OutputStream os = s.getOutputStream();
		java.io.PrintWriter op = new java.io.PrintWriter(os);
		op.println(request);
		java.io.InputStream is = s.getInputStream();
		java.io.BufferedReader di = new java.io.BufferedReader(new java.io.InputStreamReader(is));
		res.setContentType("text/html");
		while ((line = di.readLine()) != null)
			res.getOutputStream().println(line);
	} catch (Exception e) {
		try {
			res.sendError(javax.servlet.http.HttpServletResponse.SC_BAD_REQUEST, "" + e.getMessage() + "
" + line);
		} catch (java.io.IOException ioe) {
		}
	}
}
using the server headers to relocate the request - 
the 301 is the server code for redirection. This way it is also possible to alter the url.
		res.setHeader("Location", "http://point/s97is.vts?" + query );
		res.setStatus(301);