爲何post請求前先發一個options 請求？

不只僅是fetch，只要你知足如下幾種狀況，都會去發起一個 Preflighted requests，也就是options請求，參見上面連接。html It uses methods other than GET, HEAD or POST. Also, if POST is used to send request data with a Content-Type other than appl

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