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has been blocked by CORS policy: Response to preflight request doesn‘t pass access control check 報錯
時間 2021-01-06
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前端&js/jq
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和後臺聯調接口遇到一下問題,乍一看是跨域問題,但其實並不是跨域問題。由於瀏覽器將CORS請求分爲兩類:簡單請求(simple request)和非簡單請求(not-simple-request)。非簡單請求 會在正式通信之前,增加一次HTTP請求,稱之爲預檢請求。瀏覽器會先發起OPTIONS方法到服務器,以獲知服務器是否允許該實際請求。 這是在第一次預請求時候沒有請求成功,預請求不成功。 第一,先
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