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Category - Http
preflight request(预检请求)
2019-11-14 07:46:31
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## 有时候我们在调用后台接口的时候,会请求两次, 其实第一次发送的就是preflight request(预检请求) > 参考: https://www.jianshu.com/p/b55086cbd9af < 参考: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
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