Category "preflight"

Do browsers block POST requests if POST isn’t in the Access-Control-Allow-Methods value of the preflight OPTIONS response?

I think I understand CORS pretty well, but I'm still a bit puzzled about the browser's behavior when it comes to the preflight requests. Let's say the browser i

HTTP response 401 Unauthorized to CORS preflight request on ADFS WIA endpoint

I have got a problem with the WIA authentication endpoint on ADFS in Windows Server 2019 in combination with a CORS preflight request: If a client session of a