简化服务和网关上下文获取Header的方式

discovery-plugin-strategy-starter-zuul/src/main/java/com/nepxion/discovery/plugin/strategy/zuul/filter/ZuulStrategyFilterResolver.java

+package com.nepxion.discovery.plugin.strategy.zuul.filter;
+
+/**
+ * <p>Title: Nepxion Discovery</p>
+ * <p>Description: Nepxion Discovery</p>
+ * <p>Copyright: Copyright (c) 2017-2050</p>
+ * <p>Company: Nepxion</p>
+ * @author Haojun Ren
+ * @version 1.0
+ */
+
+import org.apache.commons.lang3.StringUtils;
+
+import com.netflix.zuul.context.RequestContext;
+
+public class ZuulStrategyFilterResolver {
+    public static void setHeader(String headerName, String headerValue) {
+        RequestContext context = RequestContext.getCurrentContext();
+
+        // 来自于外界的Header，例如，从Postman传递过来的Header
+        String header = context.getRequest().getHeader(headerName);
+        if (StringUtils.isEmpty(header)) {
+            context.addZuulRequestHeader(headerName, headerValue);
+        }
+    }
+}
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