2. request
req
对象表示http请求,并且具有请求查询字符串,参数,正文,http标题头等属性
app.get('/user/:id', (req, res) => {
res.send('user ' + req.params.id);
});
2.1 对应用程序实例的引用
req.app()
-
app
保存了很多对使用中间件的express
应用程序实例的引用
// one.js
module.exports = function (req, res) {
res.send('The views directory is ' + req.app.get('views'))
}
// app.js
app.get('/one', require('./one.js'));
2.2 挂载在路由实例上的URL
路径
let greet = express.Router();
greet.get('/one', (req, res) => {
console.log(req.baseUrl);// /greet
res.send('hello')
});
app.use('/greet', greet);
2.3 请求主体和cookies
-
req.body
和req.cookies
- 包含在请求正文中提交的数据的键值对,默认情况下,它是未定义的,当您使用体解析中间件(如
body-parser
和multer
)时,将被填充
const express = require('express');
const bodyParser = require('body-parser');
const cookieParser = require('cookie-parser')
let app = express();
app.use(bodyParser.json());// parsing application/json
app.use(bodyParser.urlencoded({ extended: true }));// parsing application/x-www-form-urlencoded
app.use(cookieParser())
app.post('/', (req, res) => {
console.log('Cookies: ', req.cookies);
console.log('Signed Cookies: ', req.signedCookies);
console.log('req.body', req.body);
res.json(req.body);
});
app.post('/', (req, res) => {
console.log(req.body);
res.json(req.body);
});
app.listen(3000);
2.4 主机信息
-
fresh
,hostname
,ip
,ips
,protocol
const express = require('express');
const bodyParser = require('body-parser');
const cookieParser = require('cookie-parser')
let app = express();
app.use(bodyParser.json());// parsing application/json
app.use(bodyParser.urlencoded({ extended: true }));// parsing application/x-www-form-urlencoded
app.use(cookieParser())
app.get('/files/download/:user', (req, res) => {
console.log('req.fresh:', req.fresh);
console.log('req.stale:', req.stale);
console.log('req.hostname:', req.hostname);
console.log('req.ip:', req.ip);
console.log('req.ips:', req.ips);
console.log('req.protocol:', req.protocol);
console.log('req.url:', req.url);
console.log('req.originalUrl:', req.originalUrl);
console.log('req.xhr:', req.xhr);
console.log('req.params:', req.params);
console.log('req.path:', req.path);
res.send(req.body);
});
app.listen(3000);
/***
request url: http://localhost:1111/files/download/mark
req.fresh: false
req.stale: true
req.hostname: localhost
req.ip: 127.0.0.1
req.ips: []
req.protocol: http
req.url: /files/download/mark// req.url是javascript的http模块的属性,不是Express的
req.originalUrl: /files/download/mark
req.subdomains: []
req.xhr: false
req.params: { user: 'mark' }
req.path: /files/download/mark
***/
2.5 请求路由
app.get('/user/:id?', (req, res) => {
console.log(req.route);
res.send('send get message route')
});
/***
req.route: Route {
path: '/files/download/:user',
stack:
[ Layer {
handle: [Function],
name: '<anonymous>',
params: undefined,
path: undefined,
keys: [],
regexp: /^\/?$/i,
method: 'get' } ],
methods: { get: true } }
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