目录代理服务器的原理案例搭建代理服务器解决跨域问题原理解释代理服务器的原理 案例 安装 express、Http-proxy-middleware app.js 文件 node a
安装 express、Http-proxy-middleware
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
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
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编程网。
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本文标题: 如何用nodejs搭建代理服务器
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