diff --git a/hub/server.go b/hub/server.go
index 7d7a35d6..009b122d 100644
--- a/hub/server.go
+++ b/hub/server.go
@@ -44,8 +44,8 @@ func newHub(signal chan struct{}) {
 
 	r.Use(cors.Handler)
 
-	r.Get("/traffic", traffic)
-	r.Get("/logs", getLogs)
+	r.With(jsonContentType).Get("/traffic", traffic)
+	r.With(jsonContentType).Get("/logs", getLogs)
 	r.Mount("/configs", configRouter())
 	r.Mount("/proxies", proxyRouter())
 	r.Mount("/rules", ruleRouter())
@@ -56,6 +56,14 @@ func newHub(signal chan struct{}) {
 	}
 }
 
+func jsonContentType(next http.Handler) http.Handler {
+	fn := func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		next.ServeHTTP(w, r)
+	}
+	return http.HandlerFunc(fn)
+}
+
 func traffic(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusOK)