Spring Boot，自定义身份验证处理程序和Angular 5

Question

I have next problem with my rest application. I have my backend with an custom auth handler

public class AutorizacionFilter extends OncePerRequestFilter {
@Autowired
UsuariosService usuarioService;

@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
        throws ServletException, IOException {
    String dominio = ((HttpServletRequest) request).getRequestURI();

    if ("OPTIONS".equalsIgnoreCase(request.getMethod())) {
        filterChain.doFilter(request, response);
    } else if (dominio.startsWith("/api/login") || dominio.startsWith("/api/usuarios")) {
        filterChain.doFilter(request, response);
    } else {
        String token = request.getHeader ("Authorization");

        if (token == null || !usuarioService.validarSesion(token)) {
            ((HttpServletResponse) response).sendError(HttpServletResponse.SC_UNAUTHORIZED, "your message goes here");
            return;
        }

        filterChain.doFilter(request, response);
    }
}

In my web page made witn Angular 5, I have an interceptor for catch the 401 status code

 @Injectable()
export class AuthHttpInterceptor implements HttpInterceptor {
intercept(
req: HttpRequest<any>,
next: HttpHandler
): Observable<HttpEvent<any>> {
if (!req.headers.has("Content-Type")) {
  req = req.clone({
    headers: req.headers.set("Content-Type", "application/json")
  });
}

req = req.clone({ headers: req.headers.set("Accept", "application/json") });
console.log(JSON.stringify(req.headers));
return next.handle(req).do(
  (event: HttpEvent<any>) => {
    if (event instanceof HttpResponse) {
      console.log("Autorizacion OK!");
      console.log("Code: " + event.status);
    }
  },
  (err: HttpErrorResponse) => {
    if (err.error instanceof Error) {
      console.log("An error occurred:", err.error.message);
    } else {
      console.log(
        `Backend returned code ${err.status}, body was: ${err.message}`
      );
    }
  }
);}}

When the toker expire the interceptor cant parse the answer and give me this error

Http failure response for (unknown url): 0 Unknown Error

I have a lot of reading about the problem of the httpClient with empty responses, but I cant understand how to fixed/find a way around.

Can anyone give a hand to understand this issue.

Thanks

Answer 1

Thanks to @Asura answer, I set up the response headers and solve the problem. This is the code.

if (token == null || !usuarioService.validarSesion(token)) {
            ((HttpServletResponse) response).setHeader("Access-Control-Allow-Origin", "*");
            ((HttpServletResponse) response).setHeader("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT, OPTIONS, HEAD");
            ((HttpServletResponse) response).setStatus(HttpServletResponse.SC_UNAUTHORIZED);

            return;
        }