proxy config instructions don't work

[Yahkob]

Steps to reproduce

1. npx create-react-app proxy-text
2. npm install http-proxy-middleware --save
3. create setupProxy.js with contents

const { createProxyMiddleware } = require('http-proxy-middleware');

module.exports = function (app) {
  app.use(
    '/api',
    createProxyMiddleware({
      target: 'http://google.com',
      changeOrigin: true,
    }),
  );
};

4. add useEffect to App.js with fetch to `/api':

  useEffect(() => {
    fetch('/api?s="test')
  }, [])

5. start app, inspect network

The requested URL /api was not found on this server. That’s all we know.