app2-api/middlewares/cache.js

const apicache = require('apicache');
const redis = require('redis');

let cacheWithRedis = apicache
    .options({ 
        debug: true,
        defaultDuration: '1 hour',
        redisClient: redis.createClient() 
    })
    .middleware;

// higher-order function returns false for responses of other status codes (e.g. 403, 404, 500, etc)
const onlyStatus200 = (req, res) => res.statusCode === 200

const cacheSuccesses = cacheWithRedis('1 hour', onlyStatus200);
const cache1year = cacheWithRedis('1 year', onlyStatus200);

module.exports = {
    cacheSuccesses,
    cache1year
}