Method readMetaData

backend/s3/s3.go:4016–4027

readMetaData gets the metadata if it hasn't already been fetched it also sets the info

(ctx context.Context)

//
// it also sets the info
func (o *Object) readMetaData(ctx context.Context) (err error) {
	if o.meta != nil {
		return nil
	}
	resp, err := o.headObject(ctx)
	if err != nil {
		return err
	}
	o.setMetaData(resp)
	// resp.ETag, resp.ContentLength, resp.LastModified, resp.Metadata, resp.ContentType, resp.StorageClass)
	return nil
}

// Convert S3 metadata into a map[string]string while lowercasing the
// keys