Http forward filter For S3

HttpForwardFilter.java

public class HttpForwardFilter implements javax.servlet.Filter {
    @Override
    public void destroy() {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
	String requestURI = ((HttpServletRequest)request).getRequestURI();

	File f = new File("webapps/"+ requestURI);
	if (!f.exists()) 
	{
	    String redirectUri = Application.STORAGE_FORWARD_URL + requestURI;
	    HttpServletResponse httpResponse = (HttpServletResponse) response;
	    httpResponse.sendRedirect(redirectUri);
	    return;
	}
	chain.doFilter(request, response);
   }

   @Override
   public void init(FilterConfig arg0) throws ServletException {
   }
}