origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present

完整错误信息:css Access to XMLHttpRequest at 'http://localhost:8080/test/hello? name=%E6%88%91%E7%9A%84%E9%92%B1&action=1313' from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Ori
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