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

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

技术分享 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

node proxy.js

访问:

http://localhost:3000/index.html

可以看到项目中调用的http://localhost:3000/.....  都会从http://192.168.10.38:8180/...... 获取数据,然后转发到本地。

这样就不存在跨域了。

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