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Preserve params between omniauth req & callbacks

If you need to pass a param to omniauth callbacks so that you can maintain a certain state about the user signing in you can do the following:

In the url call to omniauth provider strategy add a querystring:

<a href="/users/auth/facebook?mobile=true">Sign In with Facebook</a>

Then to retrieve it on the callback url handler:

request.env['omniauth.params']['mobile']
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