JSFiddle - React, Tailwind, and code Playground

JavaScript

m = document.createElement("meta");
   m.httpEquiv="Content-Security-Policy";
   m.content="upgrade-insecure-requests";
   document.head.append(m);
   // send request to server that mirrors Origin in Access-Control-Allow-Origin
   fetch("http://polished-glitter-21ad.hvfcetgxgijelkmhxy.workers.dev/", {credentials:"include"})
   .then(() => "CORS request succeeded", () => "CORS request failed")
   .then(result => { document.body.textContent = result; });