Facebook OWIN login not working – returning null from AuthenticationManager.AuthenticateAsync

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Using OWIN 4.0.1 on my sites – the google authentication worked fine but I couldn’t find out why the Facebook process always returned null – redirecting only to the same URL – adding the typical #_=_ to the /Account url.    Finally thought of my Cloudeflare proxy and that it might be impacting Facebook’s response.  Turning off the cache solved the issue – but maaaaan how much I have learned in the past 10+ hours spent on this 😉  #liveandlearn

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