当我的aws-amplify react应用程序向lambda函数发出请求时,它会出错,并显示以下消息: Access to XMLHttpRequest at 'https://execute-api.region.amazonaws' from origin 'https://amplifyapp.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. 仅当我在VPC