code: public static void redirect(HttpServletRequest request, HttpServletResponse response,
                                 String url) throws IOException {
          String redirectUrl;
  
          if (url.startsWith("/")) {
              redirectUrl = request.getContextPath() + url;
          } else {
              redirectUrl = url;
          }
  
          logger.debug("Redirecting to URL: {}", redirectUrl);
  
          response.sendRedirect(redirectUrl);
      }
docs: Redirects to the specified URL. If the URL starts with '/', the request context path is added.
  
  @param request   the request
  @param response  the response
  @param url       the URL to redirect to