fix:优化example (#70)

examples/quickstart/README-zh.md

@@ -81,10 +81,10 @@ go build -o consumer
 
 #### HTTP调用
 
-执行http调用，其中`${app.port}`替换为consumer的监听端口（默认为16011）。
+执行http调用，其中`${app.port}`替换为consumer的监听端口（默认为 18080 ）。
 
 ```shell
-curl -L -X GET 'http://localhost:${app.port}/echo?value=hello_world''
+curl -H 'uid: 12313' -L -X GET 'http://localhost:${app.port}/echo?value=hello_world'
 ```
 
 预期返回值：`echo: hello_world`

examples/quickstart/README.md

@@ -77,9 +77,9 @@ Login into polaris console, and check the instances in Service `EchoServerGRPC`.
 
 #### Invoke by http call
 
-Invoke http call，replace `${app.port}` to the consumer port (16011 by default).
+Invoke http call，replace `${app.port}` to the consumer port (18080 by default).
 ```shell
-curl -L -X GET 'http://localhost:47080/quickstart/feign?msg=hello_world''
+curl -L -X GET 'http://localhost:${app.port}/echo?value=hello_world'
 ```
 
 expect：`echo: hello_world`

examples/quickstart/consumer/main.go

@@ -70,11 +70,14 @@ func main() {
 		}
 
 		ctx := metadata.NewIncomingContext(context.Background(), metadata.MD{})
-		ctx = metadata.AppendToOutgoingContext(ctx, "uid", r.Header.Get("uid"))
 
-		// 请求时设置本次请求的负载均衡算法
-		ctx = polaris.RequestScopeLbPolicy(ctx, api.LBPolicyRingHash)
-		ctx = polaris.RequestScopeLbHashKey(ctx, r.Header.Get("uid"))
+		if len(r.Header.Get("uid")) != 0 {
+			ctx = metadata.AppendToOutgoingContext(ctx, "uid", r.Header.Get("uid"))
+			// 请求时设置本次请求的负载均衡算法
+			ctx = polaris.RequestScopeLbPolicy(ctx, api.LBPolicyRingHash)
+			ctx = polaris.RequestScopeLbHashKey(ctx, r.Header.Get("uid"))
+		}
+
 		resp, err := echoClient.Echo(ctx, &pb.EchoRequest{Value: value})
 		log.Printf("send message, resp (%v), err(%v)", resp, err)
 		if nil != err {