问题：
前端通过gateway调用后端接口，路由转发失败，提示404 not found
排查：
使用 { "href":"/actuator/gateway/routes", "methods": "POST", "GET" } 命令查看路由列表，确实缺少路由信息
curl -v http://127.0.0.1:9090/actuator/gateway/routes >> 123.txt
输出到 123.txt 文件
处理方式：
1、 手动刷新
{ "href":"/actuator/gateway/refresh", "methods": "POST" }
2、 手动添加
{ "href":"/actuator/gateway/routes/route-id-1", "methods": "POST", "DELETE", "GET" }
官方说明：
To create a route definition, make a POST request to /gateway/routes/{id_route_to_create} with a JSON body that specifies the fields of the route (see Retrieving Information about a Particular Route).
To delete a route definition, make a DELETE request to /gateway/routes/{id_route_to_delete}.
官网地址：
Spring Cloud Gateway
操作截图：
