Facebook redirect url issue OAuthException

Question

My app was working well for long time, but now I am getting the error from Facebook saying:

Content: {\"error\":{\"message\":\"Error validating verification c

Answer 1

I've faced some strange Facebook behavior.

My site runs https and I've always got an error "Error validating verification code. Please make sure your redirect_uri is identical".

But then I've change https to http in redirect_uri and in developer panel (OAuth urls) then error disappear and authentification start to work correctly. But site still runs https...

Hope this helps someone.