方式一:在package.json中添加proxy【 "proxy":"http://localhost:5000" 】
方法二
创建代理配置文件,在src下创建配置文件:src/setupProxy.js
编写setupProxy.js配置具体代理规则:
// const proxy=require('http-proxy-middleware') //低版本的http-proxy-middleware的引入方式,当前安装的2.0.6版本不适用
const {createProxyMiddleware: proxy} = require('http-proxy-middleware');
module.exports = function(app) {
app.use(
proxy('/api1', { //api1是需要转发的请求(所有带有/api1前缀的请求都会转发给5000)
target: 'http://localhost:5000', //配置转发目标地址(能返回数据的服务器地址)
changeOrigin: true, //控制服务器接收到的请求头中host字段的值
/*
changeOrigin设置为true时,服务器收到的请求头中的host为:localhost:5000
changeOrigin设置为false时,服务器收到的请求头中的host为:localhost:3000
changeOrigin默认值为false,但我们一般将changeOrigin值设为true
*/
pathRewrite: {'^/api1': ''} //去除请求前缀,保证交给后台服务器的是正常请求地址(必须配置)
}),
proxy('/api2', {
target: 'http://localhost:5001',
changeOrigin: true,
pathRewrite: {'^/api2': ''}
})
)
}
案例代码【App.jsx】
import React, { Component } from 'react'
import axios from 'axios';
export default class App extends Component {
getStudents=()=>{
axios.get("http://localhost:3000/api1/students").then(
res=>{console.log("res>>>",res.data);},
err=>{console.log("err>>>",err);}
)
}
getCars=()=>{
axios.get("http://localhost:3000/api2/cars").then(
res=>{console.log("res>>>",res.data);},
err=>{console.log("err>>>",err);}
)
}
render() {
return (
)
}
}
【server1.js】
const express=require("express")
const app=express()
app.use((request,response,next)=>{
console.log("有人请求服务器1了");
console.log("请求Host",request.get('Host'));
console.log("请求来自于",request.url);
next()
})
app.get("/students",(req,res)=>{
const students=[
{id:"1",name:"Tom",age:12},
{id:"2",name:"Mike",age:23},
{id:"3",name:"Jerry",age:25},
]
res.send(students)
})
app.listen(5000,()=>{
console.log("listen http://localhost:5000");
})
【server2.js】
const express=require("express")
const app=express()
app.use((request,response,next)=>{
console.log("有人请求服务器2了");
console.log("请求Host",request.get('Host'));
console.log("请求来自于",request.url);
next()
})
app.get("/cars",(req,res)=>{
const students=[
{id:"1",name:"奔驰",price:112},
{id:"2",name:"劳斯莱斯",price:623},
{id:"3",name:"保时捷",price:525},
]
res.send(students)
})
app.listen(5001,()=>{
console.log("listen http://localhost:5001");
})