CORS OPTIONS
A CORS preflight request is a CORS request that checks to see if the CORS protocol is understood and a server is aware using specific methods and headers.
https://developer.mozilla.org/en-US/docs/Glossary/Preflight_request
https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
same-origin policy
https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy
cookie & Fetch & credentials & POST
https://www.cnblogs.com/xgqfrms/p/9182177.html
https://www.cnblogs.com/xgqfrms/protected/p/9198180.html
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