在印前检查(cors)请求后,服务器将源更改为*,并且chrome不显示请求(但我查看响应正文)。 Request headers Chrome的错误: Access to fetch at 'http://localhost:6529/graphql' from origin 'http://localhost:3000' has been blocked by CORS policy: The value of the 'Access-Control-Allow-Origin' header in the response must not