zuul中FallbackProvider不生效的原因

客户端访问微服务,通过网关,如果服务挂掉了,自然也是需要熔断的.否则体验很不好.

package com.datang.pet.zuul.serverfallback;

import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

/*core服务降级*/
@Component
public class CoreFallback implements FallbackProvider {
    @Override
    public String getRoute() {
        return "core";
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.OK.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.OK.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                String response = "{\n" +
                        "    \"msg\": \"core服务失去联系,请联系管理员\",\n" +
                        "    \"code\": 400,\n" +
                        "    \"data\": null\n" +
                        "}";
                ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(response.getBytes());
                return byteArrayInputStream;
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders httpHeaders = new HttpHeaders();
                httpHeaders.setContentType(MediaType.APPLICATION_JSON);
                return httpHeaders;
            }
        };
    }


}
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但是只是这么写,把服务关掉以后并没有降级熔断,客户端收到的是404.

 找了好久才发现,原来是配置文件少配置了.

zuul.routes.core=/core/**
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这个路由配置,原来以为只是一个服务名映射,但看来还是不简单的.以上配置 .core是服务名,/core/** 指的是这个路径下的都转发到core服务