Node.js配合node-http-proxy解决本地开发ajax跨域问题

2019-11-20 09:07:15

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来源：转载

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情景：

前后端分离，本地前端开发调用接口会有跨域问题，一般有以下3种解决方法：

1. 后端接口打包到本地运行（缺点：每次后端更新都要去测试服下一个更新包，还要在本地搭建java运行环境，麻烦）

2. CORS跨域：后端接口在返回的时候，在header中加入'Access-Control-Allow-origin':* 之类的（有的时候后端不方便这样处理，前端就蛋疼了）

3. 用nodejs搭建本地http服务器，并且判断访问接口URL时进行转发，完美解决本地开发时候的跨域问题。

用到的技术：

1. nodejs搭建本地http服务器

2. 应用node-http-proxy，做接口url的转发

具体方法：

1. node.js搭建本地http服务器参考了shawn.xie的《nodejs搭建本地http服务器》

2. node.js做转发使用node-http-proxy实现，官方文档：https://github.com/nodejitsu/node-http-proxy#using-https

3. 操作方法参考了：http://hao.jser.com/archive/10394/?utm_source=tuicool&utm_medium=referral

4. 下面是我自己的实战操作

项目准备

1. npm初始化

npm init

2. 安装node-http-proxy模块

npm install http-proxy --save-dev

3. 项目结构

下面的例子中，我们把html文件直接放在根目录'./'，也可以指定一个网站目录，在proxy.js中可以自定义

配置HTTP服务器和PROXY转发

var PORT = 3000;var http = require('http');var url=require('url');var fs=require('fs');var mine=require('./mine').types;var path=require('path');var httpProxy = require('http-proxy');var proxy = httpProxy.createProxyServer({target: 'http://192.168.10.38:8180/', //接口地址// 下面的设置用于https// ssl: {// key: fs.readFileSync('server_decrypt.key', 'utf8'),// cert: fs.readFileSync('server.crt', 'utf8')// },// secure: false});proxy.on('error', function(err, req, res){res.writeHead(500, {'content-type': 'text/plain'});console.log(err);res.end('Something went wrong. And we are reporting a custom error message.');});var server = http.createServer(function (request, response) {var pathname = url.parse(request.url).pathname;//var realPath = path.join("main-pages", pathname); // 指定根目录var realPath = path.join("./", pathname);console.log(pathname);console.log(realPath);var ext = path.extname(realPath);ext = ext ? ext.slice(1) : 'unknown';//判断如果是接口访问，则通过proxy转发if(pathname.indexOf("mspj-mall-admin") > 0){proxy.web(request, response);return;}fs.exists(realPath, function (exists) {if (!exists) {response.writeHead(404, {'Content-Type': 'text/plain'});response.write("This request URL " + pathname + " was not found on this server.");response.end();} else {fs.readFile(realPath, "binary", function (err, file) {if (err) {response.writeHead(500, {'Content-Type': 'text/plain'});response.end(err);} else {var contentType = mine[ext] || "text/plain";response.writeHead(200, {'Content-Type': contentType});response.write(file, "binary");response.end();}});}});});server.listen(PORT);console.log("Server runing at port: " + PORT + ".");

MINE.JS

这里参考shawn.xie的源码，补充了几个字体文件的mime。

exports.types = {"css": "text/css","gif": "image/gif","html": "text/html","ico": "image/x-icon","jpeg": "image/jpeg","jpg": "image/jpeg","js": "text/javascript","json": "application/json","pdf": "application/pdf","png": "image/png","svg": "image/svg+xml","swf": "application/x-shockwave-flash","tiff": "image/tiff","txt": "text/plain","wav": "audio/x-wav","wma": "audio/x-ms-wma","wmv": "video/x-ms-wmv","xml": "text/xml","woff": "application/x-woff","woff2": "application/x-woff2","tff": "application/x-font-truetype","otf": "application/x-font-opentype","eot": "application/vnd.ms-fontobject"};

以上就是全部源码

然后把项目中的接口地址改成http://localhost:3000/......

启动nodejs服务

启动cmd，定位到项目目录，运行