add gateway config

Author: jiangwh

springcloud/springcloudgateway.md

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+# 定义路由
+
+增加Normal路由信息
+
+```bash
+curl -X POST -H "Content-Type: application/json"  -d '{"id":"sina","predicates":[{"args":{"_genkey_2":"/sina/**"},"name":"Path"}],"filters":[],"uri":"https://www.sina.com","order":"2"}' 127.0.0.1:8080/actuator/gateway/routes/sina
+```
+
+定义查询路由信息
+
+```bash
+curl -X POST -H "Content-Type: application/json"  -d '{"id":"sina","predicates":[{"args":{"param":"s","regexp":"1"},"name":"Query"}],"filters":[],"uri":"https://www.baidu.com","order":"1"}' 127.0.0.1:8080/actuator/gateway/routes/sina
+```
+
+
+
+增加fallback路由
+
+```bash
+curl -X POST -H "Content-Type: application/json"  -d '{"id":"sina","predicates":[{"args":{"_genkey_2":"/sina/**"},"name":"Path"}],"filters":[{"args":{"name":"fallbackcmd","fallbackUri" :"forward:/hystrixfallback"},"name":"Hystrix"}],"uri":"https://www.sccina.com","order":"2"}' 127.0.0.1:8080/actuator/gateway/routes/sina -vvv
+```
+
+增加域名 路径匹配
+
+```bash
+curl -X POST -H "Content-Type: application/json"  -d '{"id":"sina","predicates":[{"args":{"_genkey_2":"/baidu/**"},"name":"Path"},{"args":{"_genkey_3":"www.baidu.com"},"name":"Host"}],"filters":[],"uri":"https://www.baidu.com","order":"1"}' 127.0.0.1:8080/actuator/gateway/routes/sina
+```
+
+路径重写
+
+```bash
+curl -X POST -H "Content-Type: application/json"  -d '{"id":"sina","predicates":[{"args":{"_genkey_2":"/baidu/**"},"name":"Path"}],"filters":[{"name":"RewritePath","args":{"regexp":"/baidu","replacement":"/"}}],"uri":"https://www.baidu.com","order":"1"}' 127.0.0.1:8080/actuator/gateway/routes/sina
+```
+
+
+
+## 如何确定filter或者predicate的参数
+
+```java
+//HystrixGatewayFilterFactory
+//转为map
+public static class Config {
+		private String name;
+		private Setter setter;
+		private URI fallbackUri;
+}
+
+//QueryRoutePredicateFactory
+public static class Config {
+		@NotEmpty
+		private String param;
+		private String regexp;
+}
+```
+