http-proxy

2020 M12 20

代理转发

访问3000端口，会被转发到5000端口，页面显示port 5000

服务a

const app = require('http')
const httpProxy = require('http-proxy')
const proxy=httpProxy.createProxyServer()
app.createServer((req, res) => {
    proxy.web(req,res,{
        target:'http://localhost:5000'
    })
}).listen(3000, () => {
    console.log('run server 3000 ')
})

服务b

const app = require('http')
app.createServer((req, res) => {
res.end('port 5000')
}).listen(5000, () => {
console.log('run server')
})

模拟nginx反向代理

监听同一个端口，根据上下文，分发到不同的服务上。
代理机和两台服务分别跑在8080，3000，3001端口。
访问:http://localhost:8080/server/1 页面显示==>server1
访问:http://localhost:8080/server/2 页面显示==>server2

代理机proxy

const app = require('http')
const httpProxy = require('http-proxy')
const url = require('url')
const proxy = httpProxy.createProxyServer()
//代理路径映射 相当于nginx的 proxy_pass
const map = {
    '/server/1': 'http://localhost:3000',
    '/server/2': 'http://localhost:3001',
}
app.createServer((req, res) => {
    const {pathname} =url.parse(req.url)
    if (pathname === '/favicon.ico') return res.end()
    proxy.web(req, res, {
        target: map[pathname]
    })
}).listen(8080, () => {
    console.log('run server 8080 ')
})

服务机1

const app = require('http')
app.createServer((req, res) => {
    res.end('server1')
}).listen(3000)

服务机2


const app = require('http')
app.createServer((req, res) => {
    res.end('server2')
}).listen(3001)