ctx.Response.Header.Set("Access-Control-Allow-Credentials", "true") ctx.Response.Header.SetBytesV("Access-Control-Allow-Origin", ctx.Request.Peek("Origin"))
-> 넣어봐도 안됨.
https://developer.mozilla.org/ko/docs/Web/HTTP/CORS
https://www.codershood.info/2020/03/14/jwt-authentication-in-golang-tutorial-with-example-api/
https://www.codershood.info/2020/06/23/real-time-private-chatting-app-using-golang-react-and-mongodb-part-1/
-> 이것도 참고
Access to XMLHttpRequest at 'http://localhost:8080/api/users/register' from origin 'http://127.0.0.1:4200' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
https://github.com/rs/cors
https://flaviocopes.com/golang-enable-cors/
-> 이거 두개 참고 해서 해결
