Nuances of fetching data on the client and on the server

Servers and clients have different libraries that allow you to load data. In the browser, there are XMLHttpRequest and WhatWG Fetch API, and, on the server side, there are the Node.js default http and https packages. In order to load data universally (such as in an isomorphic manner,both on the server and on the client, using the same code base), we need to install an additional network layer.

There are two options here:

1. The first option is to simply polyfill the WhatWG Fetch API, since it's natively available on the client side in browsers.

In order to do that, we should install a package:

      $ npm install isomorphic-fetch --save

And then, we require/import it anywhere before fetch() usages:

      import 'isomorphic-fetch';

      (async () => {
          const res = await fetch(...); // already polyfilled...