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

时间:2016-08-29 14:29:38      阅读:602      评论:0      收藏:0      [点我收藏+]

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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

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

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原文地址:http://www.cnblogs.com/woodk/p/5817755.html

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