`redirect_uri` is not under the registered domain for this application

Question

I am trying to implement Stack Exchange authorization in my RoR application.

But I get the error :

redirect_uri is not under the registered domain for this application

in Gemfile use:

gem 'devise'
gem 'omniauth'
gem 'omniauth-stackexchange'

in devise.rb:

 config.omniauth: stackexchange, 'CLIENT_ID', 'CLIENT SECRET', callback_url: 'stackexchange.com'

Any ideas?

Answer 1

I don't know about that Ruby/Gem, but your app registration is not correct.

You need to configure your app for explicit OAuth2, per this other answer, except enter localhost instead of example.com.

^{(The localhost is based on the original version of the question. If you have a registered domain, use that.)}

Then, in your ruby code:

config.omniauth: stackexchange, 'CLIENT_ID', 'CLIENT SECRET', callback_url: 'http://localhost:3000/'

(Assuming the rest of that devise.rb code was correct. But see the OmniAuth StackExchange doc/GitHub about that.)