S3 CORS不允许两个域的来源

Question

我有一个S3存储桶，我希望允许2个域访问资源：

1. http://asubdomain.mysite.com
2. http://localhost:3000

这是CORS规则：

<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
    <CORSRule>
        <AllowedOrigin>http://asubdomain.mysite.com</AllowedOrigin>
        <AllowedMethod>GET</AllowedMethod>
        <MaxAgeSeconds>3000</MaxAgeSeconds>
        <AllowedHeader>*</AllowedHeader>
    </CORSRule>
    <CORSRule>
        <AllowedOrigin>http://localhost:3000</AllowedOrigin>
        <AllowedMethod>GET</AllowedMethod>
        <MaxAgeSeconds>3000</MaxAgeSeconds>
        <AllowedHeader>*</AllowedHeader>
    </CORSRule>
</CORSConfiguration>

然而，当我尝试访问页面上的资源时，偶尔会出现此错误。有什么想法吗？

XMLHttpRequest cannot load https://s3.amazonaws.com/my_awesome_bucket/myfile.txt. 
The 'Access-Control-Allow-Origin' header has a value 'http://localhost:3000' that is not equal to the supplied origin. 
Origin 'http://asubdomain.mysite.com' is therefore not allowed access.