Gateway动态路由引发的请求404

项目场景：

nacos+gateway 做路由转发

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问题描述

请求gateway地址:

gateway/jeecg-boot/income/statistics/login/page/

期望转发到目标服务地址：

ems-back/income/statistics/login/page/

路由配置

	{
		"id": "ems-back",
		"order": 1,
		"predicates": [
			{
				"name": "Path",
				"args": {
					"_genkey_0": "/jeecg-boot/**"
				}
			}
		],
		"filters": [
			{
				"name": "RewritePath",
				"args": {
					"_genkey_0": "/jeecg-boot/(?.*)",
					"_genkey_1": "/$\\{segment}"
				}
			}
		],		
		"uri": "lb://ems-back"
	}

结果请求到地址： 

jeecg-boot/income/statistics/login/page/

最终j请求到错误的服务导致404

原因分析：

gateway router 转发到错误的服务，应该是错误的配置了路由信息。

1.检查naocos的gateway路径配置文件，发现无jeecg-boot的路由配置

2.检查gateway 本地配置信息，也无jeecg-boot的路由配置

3.检查gateway的启动配置，发现gateway启动了动态路由配置

    gateway:
      discovery:
        locator:
          # TODO 动态路由，会把jeecg-boot开头的请求 转发到jeecg-boot的舞曲，order = 0;
          enabled: true

断点排查

FilteringWebHandler 类

    public Mono handle(ServerWebExchange exchange) {
        Route route = (Route)exchange.getRequiredAttribute(ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR);
        List gatewayFilters = route.getFilters();
        List combined = new ArrayList(this.globalFilters);
        combined.addAll(gatewayFilters);
        AnnotationAwareOrderComparator.sort(combined);
        if (logger.isDebugEnabled()) {
            logger.debug("Sorted gatewayFilterFactories: " + combined);
        }

        return (new DefaultGatewayFilterChain(combined)).filter(exchange);
    }

route 信息为：

 id = "ReactiveCompositeDiscoveryClient_jeecg-boot"
 uri = {URI@14666} "lb://jeecg-boot"
 order = 0
 predicate = {AsyncPredicate$DefaultAsyncPredicate@14667} "Paths: [/jeecg-boot/**], match trailing slash: true"
 gatewayFilters = {ArrayList@14668}  size = 1
 metadata = {HashMap@14669}  size = 6  

该uri地址为错误的服务

原因找到，gateway 自动配置了路由信息，并且该路由的order=0,优先于我们配置的目标order=1,所以该router先于我们的router拦截请求，转发到了jeecg-boot服务。

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解决方案：

• 修改ems-back, router信息，order =0,这样同样order=0,优先手动配置路由地址
• 修改项目根路径为非jeecg-boot，这样动态路由jeecg-boot服务就不会收到非jeecg-boot的根路径请求
• 修改jeecg-boot服务名为其他，这样动态路由地址也会变
• 修改动态路由为false，不会启动动态路由，所有路由得手动配置

    gateway:
      discovery:
        locator:
          enabled: false