if ( this.smb2 && ! ( request instanceof ServerMessageBlock2 ) ) {
            throw new SmbException("Not an SMB2 request " + request.getClass().getName());
        }
        else if ( !this.smb2 && ! ( request instanceof ServerMessageBlock ) ) {
            throw new SmbException("Not an SMB1 request");
        }

        this.negotiated.setupRequest(request);

        if ( response != null ) {