快速流式响应内容标头和缓存

Question

我正在尝试在express应用中了解以下两条路线之间的区别。

const express = require('express')
const app = express()
const LOG_FOLDER = '/my/log/folder'

app.get('/log_stream/:id', (req, res, next) => {
    if (req.fresh) {
        res.sendStatus(304)
    }

    let logFile = path.resolve(LOG_FOLDER, req.params.id + '.log')

    let readStream = fs.createReadStream(logFile)
    readStream.on('open', () => {
        readStream.pipe(res)
    })

    readStream.on('error', (err) => {
        res.status(500).json({ 'error': err })
    })
})

app.get('/log/:id', (req, res, next) => {
    if (req.fresh) {
        res.sendStatus(304)
    }

    let opts = {
        dotfiles: 'deny'
    }

    let logFile = path.resolve(LOG_FOLDER, req.params.id + '.log')

    let readStream = fs.createReadStream(logFile)
    readStream.on('open', () => {
        res.sendFile(logFile, opts, (err) => {
            if (err) {
                next(err)
            }
        })
    })

    readStream.on('error', (err) => {
        res.status(500).json({ 'error': err })
    })
})

app.listen(3000)

有没有首选的方法？
主要区别似乎在于标题，因为res.sendFile()函数会自动设置其中的许多标题。