anchor.diff:  void main() {
     _setupLogger();
   
  -  serverLogger.fine("Starting Server");
  +  _log.fine("Starting Server");
   
     var port = Platform.environment['PORT'] != null ?
         int.parse(Platform.environment['PORT'], onError: (_) => 8080) :
  
positive.code:               "client_secret": CLIENT_SECRET
      };
  
      serverLogger.fine("fields = $fields");
      http.Client _httpClient = new http.Client();
      _httpClient.post(TOKEN_ENDPOINT, fields: fields).then((http.Response response) {
        // At this point we have the token and refresh token.
        var credentials = JSON.parse(response.body);
        serverLogger.fine("credentials = ${response.body}");
        _httpClient.close();
  
        var verifyTokenUrl = '${TOKENINFO_URL}?access_token=${credentials["access_token"]}';
        new http.Client()
        ..get(verifyTokenUrl).then((http.Response response)  {
          serverLogger.fine("response = ${response.body}");
  
          var verifyResponse = JSON.parse(response.body);
          String userId = verifyResponse.containsKey("user_id") ? verifyResponse["user_id"] : null;
  
negative.code:         Element metaState = new Element.html('<meta name="state_token" content="${context.request.session["state_token"]}">');
          doc.head.children.add(metaState);
          context.response.write(doc.outerHtml);
          context.response.done.catchError((e) => _log.fine("File Response error: ${e}"));
          context.response.close();
        }, onError: (error) => _log.fine("error = $error"));
      } else {
        _log.fine("getIndexHandler exists = $exists");
        context.response.statusCode = 404;
        context.response.close();
      }
    })
    .catchError((e) => _log.fine("error: $e"));
  }
  
  /**
  