[英]why enabling CORS for js files by setting crossorigin= anonymous cause “blocked by CORS policy” although Access-Control-Allow-Origin exist?
我們想獲取有關從不同域加載的js腳本的錯誤信息。 根據文檔，我們在腳本標簽上設置了crossorigin =“ anonymous”屬性，並且我們從具有其他域的js服務器發送了Access-Control-Allow-Origin：*，但是在某些用戶中，並非所有chrome都阻止加載腳本文件，為什么會這樣？
來自第一個域域的html主頁中的腳本標記：
script type='text/javascript' src='myseconddomain.com/testscript.js' crossOrigin='anonymous'></script
並且testscript.js的響應標頭具有“ Access-Control-Allow-Origin：*”
似乎chrome存在一個緩存javascript文件而不查看它們的crossOrigin屬性的問題，這意味着如果頁面中引用了一個沒有crossOrigin屬性的js文件，后來您編輯並添加此屬性chrome忽略它並使用其緩存版本會導致問題
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localhost:4200 已被 CORS 策略阻止：請求的資源上不存在“Access-Control-Allow-Origin”標頭
[英]localhost:4200 has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource
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