Content-Encoding: aws-chunked should not be stored

[akheron]

After upgrading AWS SDK for Java from v2.29.1 to v2.30.6, I noticed that S3Mock started returning Content-Encoding: aws-chunked response header when reading objects through the presigned url mechanism. It seems that the new version of the SDK adds Content-Encoding: aws-chunked with PutObject requests, and S3Mock stores the content encoding header value with the object.

However, according to AWS docs, the aws-chunked value should be stripped before storing the header value:

Amazon S3 stores the resulting object without the aws-chunked value in the content-encoding header. If aws-chunked is the only value that you pass in the content-encoding header, S3 considers the content-encoding header empty and does not return this header when your retrieve the object.