Error message error validating application type oauthexception
these responses are as of december 2012, but of course facebook may decide to change them at any point in the future without warning.
Tommy Gregory, 46, served in the Air Force for 20 years and achieved the rank of lieutenant colonel before retiring from the military in 2014.
The code parameter is what I got from facebook callback. After some investigation I found the head-slapper - we doing a GET with HTTP Headers only not with a Querystring, so FB litterally wasn't seeing the Token at all.
The moral seems to be that if you can get the Token to validated in the FB Debug tool, there is likely /something/ amiss in your request - It might be a missing "/" or some other mismatch with the App's defined URL (Domain mistmatch is a different error).
facebook can fail to return an access token to your application whenever one of the parameters in the request is incorrect.
during development of my oauth framework i tested setting each required parameter to an incorrect value (ie i appended the string to the values then the access token is returned correctly in each case.
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This is an error message returned by the Facebook Graph API, best that I can tell.