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Can't replicate Facebook demo. FB requiring HTTPS #510
I strongly suspect the reason I'm getting a bad request error from the Facebook API when trying to replicate results from the Facebook demo for requesting a token via OAuth2.0 is that they have changed their policy about allowing redirects not over HTTPS. So additional configuration may be required for this to work properly.
Per Facebook's docs, the toggle for 'Enforce HTTPS' that could previously be turned off for apps has been disabled, so OAuth redirects must apparently come with a TLS certificate.
When executing the demo code, an error appears during authentication with Facebook in the browser: "Insecure Login Blocked: You can't get an access token or log in to this app from an insecure page. Try re-loading the page as https://" and R shows a Bad Request error.