lambda to add cache-control header to cloudfront

cache-control.js

exports.handler = (event, context, callback) => {
    const response = event.Records[0].cf.response;
    const headers = response.headers;
    
    headers['cache-control'] = [
        {key: 'Cache-Control',
        value: 'max-age=3600'
        }];

    callback(null, response);
};