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You need to use a filter that returns those properties. The default filter does not. Also, the API is at version 2.2. You should use that unless you've a very good reason not to. So try, for example: http://api.stackexchange.com/2.2/users/55075?site=stackoverflow&filter=!G*ky*lRuarbDJTpnwEtY-a05oz Or: ...
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