diff --git a/server/http_api.go b/server/http_api.go
index 0463ac4..ab83ed8 100644
--- a/server/http_api.go
+++ b/server/http_api.go
@@ -545,9 +545,9 @@ func (h *houstonHandler) GetDemoFileLink(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	link := path.Join(sub_folder_name_downloads, name, version, demoFileInfo.Name())
+	out := []string{path.Join(sub_folder_name_downloads, name, version, demoFileInfo.Name())}
 	enc := json.NewEncoder(w)
-	enc.Encode(link)
+	enc.Encode(out)
 }
 
 func (h *houstonHandler) GetDeployingProgress(w http.ResponseWriter, r *http.Request) {