なんとなく CORS がわかる...はもう終わりにする。 - QiitaAccess to XMLHttpRequest at 'http://localhost:8081' from origin 'http://localhost:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8080' is ther
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