I'm having a problem with the Stitch server generating a URL for the Facebook login process that appears to be double-encoded with the encodeUri() method, breaking the login process. Please see this Stack Overlow post:
https://stackoverflow.com/questions/55466427/mongodb-stitch-double-encodes-redirect-uri-during-facebook-login-attempt-breakin
This is occurring in my fork of the Web Todo app Stitch example.