title: react-native fetch() cookie persist
body: <p>I'm new to using react-native and also the <code>fetch</code> api in javascript. I authenticate my app with a backend and after several refreshes in my ios simulator the app checks if it's authenticated with the backend on the initial loading and to my surprise, it is! This begs the question of where and what is persisting inside react-native and the <code>fetch</code> api?</p>