如何在Express - Node.js上激活缓存？

npm install express-redis-cache

const express = require('express');
const redisCache = require('express-redis-cache');

const app = express();

const cache = redisCache({
  host: 'localhost',
  port: 6379,
  prefix: 'cache:',
});

app.use(cache.middleware());

app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.listen(3000, () => {
  console.log('Server started on port 3000');
});

const express = require('express');
const app = express();

app.get('/', (req, res) => {
  const file = 'example.txt';
  const stats = fs.statSync(file);
  const etag = stats.mtime.toUTCString();
  const lastModified = stats.mtime.toUTCString();

  if (req.headers['if-none-match'] === etag || req.headers['if-modified-since'] === lastModified) {
    res.status(304).send();
  } else {
    res.setHeader('ETag', etag);
    res.setHeader('Last-Modified', lastModified);
    res.sendFile(file);
  }
});

app.listen(3000, () => {
  console.log('Server started on port 3000');
});