Same origin policy
https://datatracker.ietf.org/doc/html/rfc6454 IETF RFC
https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy
CORS์ ๋์ผ ์ถ์ฒ ์ ์ฑ ์ ๋ํด ์ค๋ช ํ๋ ๋ธ๋ก๊ทธ ๊ธ