Hi Dan,

Normally, OAuth, where a User must enter their credentials and grant access, is a redirect processes and not suited for XHR based flows. And this could explain why `www.facebook.com/dialog/oauth` does not support CORS, since it's not supposed to be used in this manner.

While I don't know if Facebook supports an XHR based authentication, it seems that the omniauth gem you are using may not be configured for this type of use.

On Fri, Jun 26, 2015 at 9:01 PM, Dan <[address removed]> wrote:

I'm calling from React client with ajax to /auth/facebook which is the route provided by Omniauth. Omniauth should call facebook login and return to /auth/facebook/callback where I pick up.

Best,

Yung

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