GraphQL playground报错“Failed to fetch. Please check your connection“
作者：互联网
最近在了解GraphQL，根据https://www.graphql-java.com/tutorials/getting-started-with-spring-boot/里面的例子搭建了一个demo，结果在使用GraphQL playground来查看GraphQL demo结果的时候，报错：
Failed to fetch. Please check your connection
F12查看前台请求，发现报错为：
Access to fetch at ‘http://localhost:8080/graphql’ from origin
‘https://www.graphqlbin.com’ has been blocked by CORS policy: No
‘Access-Control-Allow-Origin’ header is present on the requested
resource. If an opaque response serves your needs, set the request’s
mode to ‘no-cors’ to fetch the resource with CORS disabled.
所以原因是跨域问题。
Spring MVC配置CORS的方式，搜索了一下找到一个博客
Spring MVC配置CORS（解决跨域请求）
采用其中的添加全局配置的方式，解决了问题。
GraphQL playground可以调用到后台的demo了!
标签：Please,your,报错,playground,CORS,GraphQL,fetch 来源： https://blog.csdn.net/wsjtwmy/article/details/116499964