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

Posted 2020-08-04 暖风

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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。

4. 使用谷歌的插件解决:https://chrome.google.com/webstore/detail/allow-control-allow-origi/nlfbmbojpeacfghkpbjhddihlkkiljbi

5. 或者谷歌开启允许跨域,参考 http://camnpr.com/archives/chrome-args-disable-web-security.html

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"
};