fix: added tag to allow http

src/frontend/public/index.html

@@ -4,6 +4,7 @@
     <meta charset="UTF-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests">
     <title>LangFLow</title>
     <script>
         window.sessionStorage.setItem("port","http://localhost:7860")