In ProviderSignInController we have a method oauth2ErrorCallback. When the user cancel authorization in facebook this method redirect to:
/signin?error=access_denied&error_description=Permissions+error
I need customize this url, how can do it?
I need redirect to my page, customized.
For now, I overrride the ProvidersignInCrontroller, but my feeling say to me that this is not the definitive solution