One thing that is never explained in these universal/isomorphic react frameworks/boilerplates is how to make a fetch() against your own server (e.g. a relative route). There's this https://zeit.co/blog/next#data-fetching-is-up-to-the-develop...

But what if my component looks like this:

  import React from 'react'
  export class exports React.Component {
    static async getInitialProps () {
      const res = await fetch('/api/user/123')
      const data = await res.json()
      return { username: data.profile.username }
    }
  }