增加从Zuul Filter获取Header的方式

discovery-springcloud-example-gateway/src/main/java/com/nepxion/discovery/plugin/example/gateway/impl/MyGatewayFilter.java

@@ -17,10 +17,12 @@ import org.springframework.core.Ordered;
 import org.springframework.http.server.reactive.ServerHttpRequest;
 import org.springframework.web.server.ServerWebExchange;
 
+import com.nepxion.discovery.common.constant.DiscoveryConstant;
+
 public class MyGatewayFilter implements GlobalFilter, Ordered {
     @Override
     public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
-        ServerHttpRequest newRequest = exchange.getRequest().mutate().header("n-d-version", "{\"discovery-springcloud-example-a\":\"1.0\", \"discovery-springcloud-example-b\":\"1.0\", \"discovery-springcloud-example-c\":\"1.0;1.2\"}").build();
+        ServerHttpRequest newRequest = exchange.getRequest().mutate().header(DiscoveryConstant.N_D_VERSION, "{\"discovery-springcloud-example-a\":\"1.0\", \"discovery-springcloud-example-b\":\"1.0\", \"discovery-springcloud-example-c\":\"1.0;1.2\"}").build();
         ServerWebExchange newExchange = exchange.mutate().request(newRequest).build();
 
         return chain.filter(newExchange);

discovery-springcloud-example-zuul/src/main/java/com/nepxion/discovery/plugin/example/zuul/impl/MyZuulFilter.java

@@ -9,6 +9,9 @@ package com.nepxion.discovery.plugin.example.zuul.impl;
  * @version 1.0
  */
 
+import org.apache.commons.lang3.StringUtils;
+
+import com.nepxion.discovery.common.constant.DiscoveryConstant;
 import com.netflix.zuul.ZuulFilter;
 import com.netflix.zuul.context.RequestContext;
 
@@ -31,7 +34,11 @@ public class MyZuulFilter extends ZuulFilter {
     @Override
     public Object run() {
         RequestContext context = RequestContext.getCurrentContext();
-        context.addZuulRequestHeader("n-d-version", "{\"discovery-springcloud-example-a\":\"1.0\", \"discovery-springcloud-example-b\":\"1.0\", \"discovery-springcloud-example-c\":\"1.0;1.2\"}");
+        // 来自于外界的Header，例如，从Postman传递过来的Header
+        String version = context.getRequest().getHeader(DiscoveryConstant.N_D_VERSION);
+        if (StringUtils.isEmpty(version)) {
+            context.addZuulRequestHeader(DiscoveryConstant.N_D_VERSION, "{\"discovery-springcloud-example-a\":\"1.0\", \"discovery-springcloud-example-b\":\"1.0\", \"discovery-springcloud-example-c\":\"1.0;1.2\"}");
+        }
 
         return null;
     }