Limit the amount of readable data from response body, honor content-length in response headers. about minio-go

[harshavardhana]

Looks like Content-Length is not set for all the S3 call replies, there is no easier and effective way to verify server sending malicious data right now, since S3 itself doesn't set Content-Length.

The reason is also i think they don't set Content-Length is since server is sending data with Transfer-Encoding set to 'chunked' . Because of this reason they do not have to. Since they guarantee that server is sending in chunks not as one large blobs for client to consume. So i think we can defer the handling of response bodies for now.. Since for chunked transfer-encoding Content-Length will not be set and we cannot effectively limit and verify this.