Omniauth: callback not firing, returns failure with “invalid credentials”

Question

The facebook authentication in my Rails application, implemented with the Omniauth gem has stopped working recently.

The problem is that the controller

Answer 1

Updating gems to their newest versions (omniauth 1.6.1 and omniauth-facebook 4.0.0) with:

bundle update omniauth
bundle update omniauth-facebook

solved the issue. I am leaving this for future reference.

Edit:

Same thing worked for google authorization:

bundle update omniauth-google-oauth2