"Content-Type":  true,
	"Content-Md5":   true,
	"User-Agent":    true,
}

// calculateSignedChunkLength - calculates the length of chunk metadata
func calculateSignedChunkLength(chunkDataSize int64) int64 {
	return int64(len(fmt.Sprintf("%x", chunkDataSize))) +
		17 + // ";chunk-signature="
		64 + // e.g. "f2ca1bb6c7e907d06dafe4687e579fce76b37e4e93b7605022da52e6ccc26fd2"
		2 + // CRLF
		chunkDataSize +
		2 // CRLF
}

		return err
	}
	return nil
}

// restoreTransitionedObject for multipart object chunks the file stream from remote tier into the same number of parts
// as in the xl.meta for this version and rehydrates the part.n into the fi.DataDir for this version as in the xl.meta

		// Windows can lock up with this optimization, so we fall back to regular copy.
		sr, ok := rc.(*sendFileReader)
		if ok {
			// Sendfile sends in 4MiB chunks per sendfile syscall which is more than enough
			// for most setups.
			_, err = rf.ReadFrom(sr.Reader)
			if !xnet.IsNetworkOrHostDown(err, true) { // do not need to log disconnected clients

			accessKey:          credentials.AccessKey,
			secretKey:          credentials.SecretKey,
			shouldPass:         false,
			fault:              malformedEncoding,
		},
		// Test case - 8
		// Chunk with shorter than advertised chunk data.
		{
			bucketName:         bucketName,
			objectName:         objectName,
			data:               oneKData,
			dataLen:            1024,
			chunkSize:          1024,