anchor.diff:      print('Query: ${req.queryParameters}');
       var token = req.queryParameters['oauth_token'] as String;
       var verifier = req.queryParameters['oauth_verifier'] as String;
  -    var loginData = await _createAccessToken(token, verifier);
  +    var loginData = await getAccessToken(token, verifier);
       var twitter = Twitter(this.options.clientId, this.options.clientSecret,
           loginData['oauth_token'], loginData['oauth_token_secret']);
       return await this.verifier(twitter, req, res);
  
positive.code:     return _parseUrlEncoded(request);
    }
  
    Future<Map<String, String>> createRequestToken() async {
      var request = await _prepRequest("oauth/request_token",
          method: "POST",
          data: {"oauth_callback": options.redirectUri.toString()});
  
negative.code:     return Uri.splitQueryString(body);
    }
  
    Future<Map<String, String>> getAccessToken(
        String token, String verifier) async {
      var request = await _prepRequest("oauth/access_token",
          method: "POST", data: {"verifier": verifier}, accessToken: token);
  