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has been blocked by CORS policy: Response to preflight request doesn‘t pass access control check 报错
时间 2021-01-06
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前端&js/jq
vue
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和后台联调接口遇到一下问题,乍一看是跨域问题,但其实并不是跨域问题。由于浏览器将CORS请求分为两类:简单请求(simple request)和非简单请求(not-simple-request)。非简单请求 会在正式通信之前,增加一次HTTP请求,称之为预检请求。浏览器会先发起OPTIONS方法到服务器,以获知服务器是否允许该实际请求。 这是在第一次预请求时候没有请求成功,预请求不成功。 第一,先
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