Next.js - Error: only absolute urls are supported

I'm using express as my custom server for next.js. Everything is fine, when I click the products to the list of products

Step 1: I click the product Link

Step 2: It will show the products in the database.

However if I refresh the /products page, I will get this Error

Server code (Look at /products endpoint)

app.prepare()
.then(() => {
  const server = express()

  // This is the endpoints for products
  server.get('/api/products', (req, res, next) => {
    // Im using Mongoose to return the data from the database
    Product.find({}, (err, products) => {
      res.send(products)
    })
  })

  server.get('*', (req, res) => {
    return handle(req, res)
  })

  server.listen(3000, (err) => {
    if (err) throw err
    console.log('> Ready on http://localhost:3000')
  })
})
.catch((ex) => {
  console.error(ex.stack)
  process.exit(1)
})

Pages - products.js (Simple layout that will loop the products json data)

import Layout from '../components/MyLayout.js'
import Link from 'next/link'
import fetch from 'isomorphic-unfetch'

const Products = (props) => (
  <Layout>
    <h1>List of Products</h1>
    <ul>
      { props.products.map((product) => (
        <li key={product._id}>{ product.title }</li>
      ))}
    </ul>
  </Layout>
)

Products.getInitialProps = async function() {

  const res = await fetch('/api/products')
  const data = await res.json()

  console.log(data)
  console.log(`Showed data fetched. Count ${data.length}`)

  return {
    products: data
  }
}

export default Products

Get this solution programmatically \u2014 free, no authentication.