Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin
，，webservice服務中，webConfig中添加以上配置，缺一不可 ...
原文：跨域請求錯誤： Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource
今天在學習Angular 的HttpInterceptor 攔截器時，發現添加了新的headers鍵值之后總是報跨域錯誤。后台使用的是asp.net core。 檢查發現，在添加了新的header之后，每次請求之前都會先發送一個options請求，這個請求被后台拒絕了，所以導致報錯。我的后台跨域代碼只啟用了 AllowAnyOrigin 方法，所以拒絕了options請求。 為什么會產生opti ...
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