HTTP requests three ways - Fetch API vs jQuery.ajax vs Superagent

fetch_vs_jquery_vs_superagent.js

/*
 * Client-side HTTP requests three ways, using ES6 syntax.
 * 1. jQuery.ajax()
 * 2. Superagent
 * 3. Fetch API
 * 4. Bonus helper
 */ 

// 1. jQuery.ajax()
// http://api.jquery.com/jquery.ajax/
import jquery from 'jquery';

jquery.ajax({
  method: "GET",
  url: 'https://jsonplaceholder.typicode.com/users',
  headers: {
    'custom-head': 'custom ',
  },
  })
  .done((result) => {
    console.log(result);
  })
  .fail((jqXHR, textStatus, error) => {
    console.log(textStatus);
  });


// 2. Superagent
// https://github.com/visionmedia/superagent
import request from 'superagent';

request
  .get('https://jsonplaceholder.typicode.com/users')
  .set('custom-header', 'custom header value')
  .end((error, response) => {
    if (error) {
      console.log(error);
    } else {
      console.log(response.body);
    }
  });

// 3. Fetch API
// 'isomorphic-fetch' is optional. It will include a [Fetch API polyfill](https://github.com/github/fetch) 
// [if needed](http://caniuse.com/#feat=fetch) (e.g for IE).
import fetch from 'isomorphic-fetch'; 

  fetch('https://messaging.settled.co.uk/debug')
  .then(response => {
    // This response from a server could contain a HTTP error code but it will 
    // still end up here. To throw this as an error see checkFetchStatus() below
    // and uncomment the following:
    // checkFetchStatus(response)
    console.log(response);
  })
  .catch(error => {
    // Network or timeout error.
    console.log(error);
  });


// 4. Bonus: Fetch API respnse status check helper

/**
 * Check the status of a returned Fetch API call and throw an error if the 
 * server returns an error code.
 * See https://www.tjvantoll.com/2015/09/13/fetch-and-errors/
 */
function checkFetchStatus(response) {
  if (response.status >= 200 && response.status < 300) {
    return response;
  } else {
    const error = new Error(response.statusText);
    error.response = response;
    throw error;
  }
}

Hi nice gist
Could you demonstrate how to parse and process json as a stream ?