This API controller is working fine locally but when the server is deployed as lambda function the downloaded zipfile is corrupt

Question

export const downloadFiles3 = async (req: Request, res: Response) => {
    const key = req.params.key;

    try {
        const getObjectParams = {
            Bucket: process.env.AWS_BUCKET || '',
            Key: key,
        };

        const data = await s3.getObject(getObjectParams).promise();

        res.setHeader('Content-Type', 'application/zip');
        res.setHeader('Content-Disposition', `attachment; filename=${key}`);

        res.send(data.Body);

        console.log('File sent successfully.');
    } catch (error) {
        if (!res.headersSent) {
            if (error instanceof Error) {
                console.log('Error retrieving file content:', error);
                res.status(500).json({
                    message: 'Error retrieving file content',
                    error: error.message,
                });
            } else {
                console.log('Unexpected error:', error);
                res.status(500).json({
                    message: 'Unexpected error',
                    error: String(error),
                });
            }
        } else {
            console.log('Response headers already sent:', error);
        }
    }
};

I tried to stream the response , it also worked locally but not when i deployed on aws. I am getting no errors in aws cloudwatch.

the zipfile being downloaded is corrupt