diff --git a/pkg/apiserver/servicemesh/tracing/handlers.go b/pkg/apiserver/servicemesh/tracing/handlers.go
index 12adf0f4c3b0228160f2f03eda066a06fce0946e..be6adaaa439d8df2cc12a9175730d786ba0d8bc6 100644
--- a/pkg/apiserver/servicemesh/tracing/handlers.go
+++ b/pkg/apiserver/servicemesh/tracing/handlers.go
@@ -35,6 +35,8 @@ func GetServiceTracing(request *restful.Request, response *restful.Response) {
 		return
 	}
 
+	// need to set header for proper response
+	response.Header().Set("Content-Type", "application/json")
 	_, err = response.Write(body)
 
 	if err != nil {