If you were a web developer before CORS existed, then you understand that cross-domain requests were forbidden all along and CORS was created to bypass this security. Therefore to do the thing you want to do, you need to enable CORS. No problem, that’s pretty easy.

If you only picked up web development after CORS existed, then you try to make a cross-origin request; the browser understands that it isn’t allowed; the browser tries to do a CORS preflight request; the preflight request fails; and the browser reports a CORS error in the console.

So if you don’t understand what’s going on, don’t RTFM, and just guess, you’re going to guess that CORS is the thing that is blocking the request and that you need to disable CORS. And that leads you directly into a confusing mess because you are trying to do the exact opposite of what you need to do. CORS is the solution to your problem, not the cause of it.

It doesn’t help matters that a whole bunch of people with the same misunderstanding will confidently repeat that misunderstanding in tutorials and online discussions.

While CORS is not intuitive, it is understandable by RTFM.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/COR...

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