China region abnomallies

the endpoint for the new amazon region in beijing is a bit different.

the endpoint is in the fashion of `s3.cn-north-1.amazonaws.com.cn`

the bucket name is structured as `s3.cn-north-1.amazonaws.com.cn/` as opposed to the standard issue `.`

has anyone been working on this issue?

Start by locating the S3 endpoint and bucket URL construction in this JavaScript library, then compare the existing format with the Beijing endpoint described in the issue. Done means requests for the China region use the regional endpoint and bucket path format without breaking standard regions; add or run the relevant request tests if they are present.

Written by the indexing model from the issue text.