JSF 양식 제출 시 승인 리디렉션이 실패하는 이유는 무엇입니까?

<code class="java">@WebFilter("/*")
public class AuthorizationFilter implements Filter {

    // Generate XML response for AJAX redirects
    private static final String AJAX_REDIRECT_XML = "...";

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws ... {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        HttpSession session = request.getSession(false);

        // Define authorization flags
        boolean loggedIn = ...;
        boolean loginRequest = ...;
        boolean resourceRequest = ...;
        boolean ajaxRequest = ...;

        // Handle authorization and redirection
        if (loggedIn || loginRequest || resourceRequest) {
            // Continue request
            chain.doFilter(request, response);
        } else if (ajaxRequest) {
            // Return XML response for AJAX redirects
            response.getWriter().printf(AJAX_REDIRECT_XML, loginURL);
        } else {
            // Perform synchronous redirect
            response.sendRedirect(loginURL);
        }
    }
}</code>