javascript 示例应用程序将使用Apache格式将所有请求记录到文件，但错误响应将记录到控制台

Posted 2021-05-03

var express = require('express')
var fs = require('fs')
var morgan = require('morgan')
var path = require('path')
 
var app = express()
 
// log only 4xx and 5xx responses to console
app.use(morgan('dev', {
  skip: function (req, res) { return res.statusCode < 400 }
}))
 
// log all requests to access.log
app.use(morgan('common', {
  stream: fs.createWriteStream(path.join(__dirname, 'access.log'), { flags: 'a' })
}))
 
app.get('/', function (req, res) {
  res.send('hello, world!')
})