// must be extracted from the header.
var userMetadataKeyPrefixes = []string{
	"x-amz-meta-",
	"x-minio-meta-",
}

// extractMetadataFromReq extracts metadata from HTTP header and HTTP queryString.
func extractMetadataFromReq(ctx context.Context, r *http.Request) (metadata map[string]string, err error) {
	return extractMetadata(ctx, textproto.MIMEHeader(r.Form), textproto.MIMEHeader(r.Header))
}

		// decryption if the file was actually multipart or not.
		encMetadata[ReservedMetadataPrefix+"Encrypted-Multipart"] = ""
	}

	// Extract metadata that needs to be saved.
	metadata, err := extractMetadataFromReq(ctx, r)
	if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	if objTags := r.Header.Get(xhttp.AmzObjectTagging); objTags != "" {

	}

	// if x-amz-metadata-directive says REPLACE then
	// we extract metadata from the input headers.
	if isDirectiveReplace(r.Header.Get(xhttp.AmzMetadataDirective)) {
		emetadata, err := extractMetadataFromReq(ctx, r)
		if err != nil {
			return nil, err
		}
		if sc != "" {
			emetadata[xhttp.AmzStorageClass] = sc
		}
		return emetadata, nil
	}

	if sc != "" {