CORS policy: header is present on the requested
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Access to XMLHttpRequest at 'http://127.0.0.1:8004/down/download' from origin 'http://127.0.0.1:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
解决方法
response.setHeader("Access-Control-Allow-Origin","*");
response.setHeader("Access-Control-Allow-Methods","POST,GET,OPTIONS");
response.setHeader("Access-Control-Allow-Headers"," Origin, X-Requested-With, Content-Type, Accept");
请求结果: