Changes

Summary

1. change signature to match Amazon S3 REST API (details)
2. check key constraint (details)
3. extract Gathering ErrorMessage (details)
4. remove chunked Output as it seems not to be supported by the server (details)
5. set the Request method (details)
6. Extend Minio Client Signature to provide more S3 Services (details)

change signature to match Amazon S3 REST API

check key constraint

extract Gathering ErrorMessage

remove chunked Output as it seems not to be supported by the server

set the Request method

Extend Minio Client Signature to provide more S3 Services