title: Passport auth in express backend using React Native/Expo
body: <p>I've been working on a companion app in React Native/Expo for a MERN web app that I created. In the back end, I have an Express server with Passport to authenticate users to Spotify as part of the sign in process, bound to the route <code>/auth/spotify</code>. On my web app, if I click the login button I'm redirected to the Spotify auth page. However, I can't seem to get it to work on React Native. Currently I'm using <code>axios</code> to send a GET request to <code>/auth/spotify</code> but it's seemingly not doing anything. I've checked the logs and the auth route is returning a 302 status, but the <code>/callback</code> url is never accessed. In the callback I have a <code>console.log</code> plus some code that accesses the database, but I've confirmed that neither of them are run when trying to auth from React Native.</p>
  
  <p>I looked for tutorials but a lot of the stuff I found was outdated or used deprecated packages, so I'm kind of lost right now. Would greatly appreciate it if someone could point me in the right direction. Thanks!</p>