PUT請求 出現401，且Request Method變成了OPTIONS。No 'Access-Control-Allow-Origin' header

Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.   發送PUT的請求，出現了OPTIONS請求的跨域錯誤，這是爲什麼呢？ 原來是跨域的時候，對於PUT、POST、

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