// so we do not want to override them, copy them instead.
	maps.Copy(metadata, encMetadata)

	// Ensure that metadata does not contain sensitive information
	crypto.RemoveSensitiveEntries(metadata)

	if isCompressible(r.Header, object) {
		// Storing the compression metadata.
		metadata[ReservedMetadataPrefix+"compression"] = compressionAlgorithmV2
	}

	opts, err := putOptsFromReq(ctx, r, bucket, object, metadata)

			return
		}
	}

	var compressMetadata map[string]string
	// No need to compress for remote etcd calls
	// Pass the decompressed stream to such calls.
	isDstCompressed := isCompressible(r.Header, dstObject) &&
		length > minCompressibleSize &&
		!isRemoteCopyRequired(ctx, srcBucket, dstBucket, objectAPI)
	if isDstCompressed {
		compressMetadata = make(map[string]string, 2)

}

// Disabling compression for encrypted enabled requests.
// Using compression and encryption together enables room for side channel attacks.
// Eliminate non-compressible objects by extensions/content-types.
func isCompressible(header http.Header, object string) bool {
	globalCompressConfigMu.Lock()
	cfg := globalCompressConfig
	globalCompressConfigMu.Unlock()

	return !excludeForCompression(header, object, cfg)
}

which is a fitness factor for a lossless data compression.

Pre-compressed input typically compresses in excess of 2GiB/s per core,
so performance impact should be minimal even if precompressed data is re-compressed.
Decompressing incompressible data has no significant performance impact.

Below is a list of common files and content-types which are typically not suitable for compression.

- Extensions

 | `gz`  | (GZIP)      |