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並前往https://stackoverflow.com/questions/32500073/request-header-field-access-control-allow-headers-is-not-allowed-by-itself-in-pr

Request header field Access-Control-Allow ... - Stack Overflow

When you start playing around with custom request headers you will get a CORS preflight. This is a request that uses the HTTP OPTIONS verb ...

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查詢 「HTTP header Allow」的人也找了：

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