如何通过Node和express-http-proxy构建高效API网关？

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复制代码，请务必注意请求头，以下为修改后的内容：

javascriptvar express=require('express');var proxy=require('express-http-proxy');var app=express();

app.all('*', function(req, res, next) { res.header('Access-Control-Allow-Origin', '*'); res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept'); next();});

app.use(proxy('https://example.com', { proxyReqOptDecorator: function(proxyReqOpt, req, res) { proxyReqOpt.headers['X-Custom-Header']='value'; }}));

app.listen(3000, function() { console.log('Server is running on port 3000');});

拷贝代码备忘，filter过滤请求，proxyReqOptDecorator重写请求头，代码如下：

var express = require('express'); var proxy = require('express-http-proxy') var app = express(); app.all('*', function (req, res, next) { res.header("Access-Control-Allow-Origin", req.headers.origin); res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS"); res.header("Access-Control-Allow-Credentials", "true"); res.header("Content-Type", "application/json;charset=utf-8"); if (req.method == 'OPTIONS') { res.header('Access-Control-Allow-Headers', req.headers['access-control-request-headers']); res.send(200); /*让options请求快速返回*/ } else { next(); } }); // 代码转发 app.use('/ProxySSO', proxy(req => { return req.headers.apiurl }, { filter: function (req, res) { // 用户名\系统标识\用户权限 let { systemName, masterName, powers } = req.tokenDecode; const { originalUrl } = req; const url = originalUrl.replace('/ProxySSO', '').split('?')[0]; /** * 接口权限检查 * @param {String} url 接口地址 * @param {Object} powers rbac权限列表 * @returns {boolean} 是否有权限 */ const checkPowers = (url, powers) => { // do something } const hasPowers = checkPowers(url, powers); // 权限判断 return hasPowers; }, proxyReqOptDecorator: function(proxyReqOpts, srcReq) { // header增加masterName 具体按照自己的需求来 // proxyReqOpts.headers['masterName'] = srcReq.tokenDecode.masterName; return proxyReqOpts; } })); module.exports = app;

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