如何在不导致磁盘读取的情况下提供静态文件？

Question

res.sendFile is the recommended way to send a static file using express . However, from what I can tell, res.sendFile is reading file from the disk on every request, eg

router.get('/', (req, res) => {
    res.sendFile('./guest.js');
});

Accessing / will make a disk read on every request.

Answer 1

Assuming that express does indeed read on every request (it is hard to confirm, because it could be using a clever cache that utilises fs.watch or fs.stat to asses whether to read a new file), then a simple solution is to get the file's content into a variable and serve it using res.rend , eg

const guestScript = fs.readFileSync('./guest.js', 'utf-8');

router.get('/', (req, res) => {
    res
        .set('Content-Type', 'application/javascript')
        .send(guestScript);
});