Summary:
The existing loading page was not behaving the way it was intended. The previous implementation triggered a page reload which made the whole retry mechanism useless.
Instead, a new endpoint was defined to expose whether the server is ready or not. Use this instead as a way of knowing whether we are good to reload the page.
Reviewed By: passy
Differential Revision: D49314749
fbshipit-source-id: eb67765d7deab8610fa5d31e710070da43a18c1c
9e219b07d8
