throw exceptionSet.iterator().next();
            }
            writer.flush();
            final ExtractData extractData = new ExtractData(writer.toString());
            extractMetadata(document, extractData);
            return extractData;
        } catch (final Exception e) {
            throw new ExtractException(e);
        }
    }

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))
}

func extractMetadata(ctx context.Context, mimesHeader ...textproto.MIMEHeader) (metadata map[string]string, err error) {
	metadata = make(map[string]string)

	for _, hdr := range mimesHeader {

					continue
				}
				if strings.HasPrefix(k, "minio.metadata.") {
					k = strings.TrimPrefix(k, "minio.metadata.")
					hdrs.Set(k, v)
				}
			}
			m, err := extractMetadata(ctx, textproto.MIMEHeader(hdrs))
			if err != nil {
				return err
			}
			for k, v := range m {
				metadata[k] = v
			}
		} else {
			versionID = r.Form.Get(xhttp.VersionID)