Unable to get access token from Facebook. Got an OAuthException says “Error validating verification code”

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I recently dealt with exactly this problem: everything matched, but it failed with the OAuthException. The thing that made it work was to change the redirect uri (in both requests for the flow) from:

http://foo.example.com

to

http://foo.example.com/

I.e., add the trailing slash. And then it worked. Stupid and silly, but there you go.

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