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Hello Shark!
I guess you'll get enought info from the following links
S3 docs itself:
http://docs.aws.amazon.com/AmazonS3/latest/dev/VirtualHosting.html
and UNA+S3 requests:
https://una.io/page/view-discussion?id=237
https://una.io/page/view-discussion?id=579
https://una.io/page/view-discussion?id=666
With the best regards, Leonid