examples/multipart-s3/README.md

use : https://github.com/rusoto/rusoto

https://www.rusoto.org/regions.html
https://docs.rs/rusoto_core/0.42.0/rusoto_core/enum.Region.html

1. set env  AWS_ACCESS_KEY_ID
2. set env  AWS_SECRET_ACCESS_KEY
3. set env  AWS_S3_BUCKET_NAME

1. multipart/post aws-s3 upload
2. multipart/post post-data to struct