Week 3 - Resources HTTP Eloquent JavaScript chapter 17 (HTTP requests) REST and HTTP Best practices to build RESTful web services (PDF) AJAX Using XMLHttpRequest Access control on MDN Adding CORS support to the server An intro to CORS from Nicholas Zakas API What is an API? In English, please What is an API (Youtube video) Zapier's Introduction to APIs Concealing API keys when pushing to GitHub Postman's documentation. CSS Flexbox froggy A complete guide to flexbox