Great question — answering as the UphillTech team:
As the error states, you will have to use an absolute URL for the fetch you're making. I'm assuming it has something to do with the different environments (client & server) on which your code can be executed. Relative URLs are just not explicit & reliable enough in this case. One way to solve this would be to just hardcode the server address into your fetch request, another to set up a config module that reacts to your environment: /config/index.js const dev = process.env.NODE_ENV !== 'production'; export const server = dev ? 'http://localhost:3000' : 'https://your_deployment.server.com'; products.js import { server } from '../config'; // ... Products.getInitialProps = async function() {...
Full answer by Fabian Schultz: https://stackoverflow.stackexchange.com/a/44344023 (CC BY-SA 3.0).
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