nodejs搭建代理服务器

时间:2022-09-28 Anita-Sun 人气:0

代理服务器的原理

案例

安装 express、http-proxy-middleware

app.js 文件 node app.js

var express = require('express');
var app = express();
app.use(express.static('./public'));
app.listen(3000);

在 public 文件夹下建立 a.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button onclick="Click()">点击发送请求</button>
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
    <script>
        function Click() {
             axios('http://localhost:5000/b')
                 .then(function(res) {
                     console.log(res);
                 });
        }
    </script>
</body>
</html>
</body>
</html>

搭建接口服务器，接口服务器端口号 5000

node interface.js

var express = require('express');
var app = express();

app.get("/", (req, res) => {
    res.send("123");
});

app.get("/api/a", (req, res) => {
    res.send("a");
});

app.get("/b", (req, res) => {
    console.log(req.headers);
    res.send("b");
});

app.listen(5000);

访问http://localhost:3000/a.html

搭建代理服务器解决跨域问题

更改 app.js

var express = require('express');
var proxy = require('http-proxy-middleware');
var app = express();
app.use(express.static('./public'));

app.use('/api', proxy.createProxyMiddleware({
    target: 'http://localhost:5000',
    changeOrigin: false,
    pathRewrite: {
        "^/api": ""
    }
}));
app.listen(3000);

更改 a.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button onclick="Click()">点击发送请求</button>
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
    <script>
        function Click() {
            // axios('http://localhost:5000/b')
            //     .then(function(res) {
            //         console.log(res);
            //     });

            axios('/api/b')
                .then(function(res) {
                    console.log(res);
                });
        }
    </script>
</body>
</html>
</body>
</html>

访问 http://localhost:3000/a.html

原理解释

将 a.html 请求地址改为 /api/b，那么发送请求的时候会自动补上主机和端口号http://localhost:3000

所以请求发送到了3000端口

参数含义

target: 转发到的目标地址
changeOrigin: 是否更改host。默认为false，不重写

true

false

pathRewrite：路径重写（在这里是去掉’api’）

最终请求被转发到了 http://localhost:5000/b

app.get("/b", (req, res) => {
    console.log(req.headers);
    res.send("b");
});

整个过程就像这样

以上为个人经验，希望能给大家一个参考，也希望大家多多支持。

加载全部内容