#CORS/Preflight request/OPTIONS http method

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prisma plinth
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/OPTIONS
In CORS, a preflight request is sent with the HTTP OPTIONS method.

These three things are currently important for me to understand in depth: CORS, preflight request, and HTTP OPTIONS method.
My workplace have some bugs with these, and I need to fix it. But I can only find the mozilla developer guide about OPTIONS method that briefly glances over it.

Anyone know where I can dive deeper into this and learn it good enough, such that I can debug and fix complicated errors related to it? What would such a topic even be called if I have to search for books/courses about it?

trail lanternBOT
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prisma plinth
shut void
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MDN explains the topic in details https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#preflighted_requests

MDN Web Docs
Cross-Origin Resource Sharing (CORS) - HTTP | MDN

Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources. CORS also relies on a mechanism by which browsers make a "preflight" request to the server hosting the cross-origin resource, in ord...

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Although book would be probably better.