问Google连接返回错误401

EN

  var url='https://app.ecwid.com/api/v1/XXX/orders'

  var parameters = { method : 'get',
                    headers : {'Authorization': 'Bearer '+'yyy'}, 
                    contentType:'application/json',                   
                    muteHttpExceptions:true};

  var response = UrlFetchApp.fetch(url,parameters).getContentText();

  Logger.log(response);

HTTP ERROR 401
Problem accessing /api/v1/XXX/orders. Reason:
    Unauthorized