cors์— ๋Œ€ํ•œ ๊ธ€.link

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https://evan-moon.github.io/2020/05/21/about-cors/

https://velog.io/@jmkim87/%EC%A7%80%EA%B8%8B%EC%A7%80%EA%B8%8B%ED%95%9C-CORS-%ED%8C%8C%ED%97%A4%EC%B3%90%EB%B3%B4%EC%9E%90