title: React App on Heroku responds to all requests with index.html
body: <p>I've been trying to fix an error in my application for days and am hoping for some help. I am able to run my app perfectly fine on my localhost, but when pushed to Heroku (React FE Node BE) I am able to navigate around my site, but GET/POST requests do not work. All of my get requests return my index.html file, and all of my POST requests (logging in mainly) return a 405 error &quot;not allowed&quot;.</p>
  <p>My app is hosted here: <a href="https://www.testofstrength.app" rel="nofollow noreferrer">https://www.testofstrength.app</a>
  The codebase is here: <a href="https://github.com/mgitto1/test-of-strength/tree/New" rel="nofollow noreferrer">https://github.com/mgitto1/test-of-strength/tree/New</a> (within the &quot;New&quot; branch specifically.</p>
  <p>Help would be greatly appreciated</p>