问在Zuul网关中，如何修改自定义过滤器中的服务路径？

EN

@Slf4j
public class CustomRedirectFilter extends ZuulFilter {

    @Override
    public String filterType() {
        return FilterConstants.PRE_TYPE;
    }

    @Override
    public int filterOrder() {
        return FilterConstants.SEND_FORWARD_FILTER_ORDER;
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() {
        RequestContext ctx = RequestContext.getCurrentContext();
        String requestUrl = ctx.getRequest().getRequestURL().toString();

        if (shouldBeRedirected(requestUrl)) {
            String redirectUrl = generateRedirectUrl(ctx.getRequest());
            sendRedirect(ctx.getResponse(), redirectUrl);
        }
        return null;
    }

    private void sendRedirect(HttpServletResponse response, String redirectUrl){
        try {
            response.setHeader(HttpHeaders.LOCATION, redirectUrl);
            response.setStatus(HttpStatus.MOVED_PERMANENTLY.value());
            response.flushBuffer();
        } catch (IOException ex) {
            log.error("Could not redirect to: " + redirectUrl, ex);
        }
    }

    private boolean shouldBeRedirected(String requestUrl) {
        // your logic whether should we redirect request or not
        return true;
    }

    private String generateRedirectUrl(HttpServletRequest request) {
        String queryParams = request.getQueryString();
        String currentUrl =  request.getRequestURL().toString() + (queryParams == null ? "" : ("?" + queryParams));
        // update url
        return updatedUrl;
    }
}