I'm noodling about with an OS X menubar app and thought I'd be able to use a custom URI scheme for the OAuth Redirect URI...
When the redirect URI is something like
http://localhost and I call:
customscheme://auth
then once I login, instead of being redirected, the EB page shows a "Oops, something went wrong!" so I guess there's some parsing or pre-checking of the redirect uri going on, which causes the error before the redirect.
I was using a custom URI scheme, as it seemed the easiest way for my desktop app to get hold of the oAuth token. Has anyone done anything similar?