Efficient ES6 async await with fetch

https://gist.github.com/prof3ssorSt3v3/a70a75e65be1f65d31ef93b56c2c954d
https://www.youtube.com/watch?v=ycJOZp_wWak

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    <title>Document</title>
    <!--
      Combining async await with fetch
    -->
  </head>
  <body>
    <script>
      (async function f() {
        let badurl = "http://";
        let goodurl = "http://jsonplaceholder.typicode.com/users";
        let url = Math.round(Math.random()) ? badurl : goodurl;

        let data = await (await fetch(url).catch(handleErr)).json();
        if (data.code && data.code == 400) {
          //problem
          return;
        }
        console.log(data);
      })();

      function handleErr(err) {
        console.warn(err);
        let resp = new Response(
          JSON.stringify({
            code: 400,
            message: "Stupid network Error"
          })
        );
        return resp;
      }
    </script>
  </body>
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Efficient ES6 async await with fetch

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