Providing redirects in Servlet filter

Question

Hi,
I need to provide serverside redirects in Servlet filter.O tried the below code, But unable to do it.
Is it possible to do such a thing.
public void doFilter(ServletRequest req, ServletResponse res,
               FilterChain chain) throws IOException, ServletException {
          logger.info("Start of RedirectFilter ");
          HttpServletRequest request = (HttpServletRequest) req;
          HttpServletResponse response = (HttpServletResponse) res;
          String requestURI=request.getRequestURI();
          String domainURL=request.getServerName().toLowerCase();
          logger.info("domainName--"+domainName);
          String keywordToBeAppended=domainURL.replaceAll(domainName,"");
          logger.info("url--"+request.getRequestURI());
          logger.info("servername--"+request.getServerName());
          logger.info("keywordToBeAppended-"+keywordToBeAppended);
          String finalURL= request.getScheme()+"://"+domainURL+"/"+keywordToBeAppended+requestURI;
          logger.info("finalURL--"+finalURL);
          RequestDispatcher rd = request.getRequestDispatcher(finalURL);
          rd.forward(request, response);
          logger.info("End of RedirectFilter ");
          chain.doFilter(request, response);
     }

Answer 1

There is technically a huge difference between "redirect" and "forward". You're doing here forwards. And because you continue the filter chain, you run into problems. You should do either a forward OR continuing the current request unchanged (through the filter chain) OR send a redirect. You cannot do one or more simultaneously.