Node.js配合node-http-proxy解決本地開發ajax跨域問題

情景:

先後端分離,本地前端開發調用接口會有跨域問題,通常有如下3種解決方法:javascript

1. 後端接口打包到本地運行(缺點:每次後端更新都要去測試服下一個更新包,還要在本地搭建java運行環境,麻煩)css

2. CORS跨域:後端接口在返回的時候,在header中加入'Access-Control-Allow-origin':* 之類的(有的時候後端不方便這樣處理,前端就蛋疼了)html

3. 用nodejs搭建本地http服務器,而且判斷訪問接口URL時進行轉發,完美解決本地開發時候的跨域問題。前端

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

5. 或者谷歌開啓容許跨域,參考 http://camnpr.com/archives/chrome-args-disable-web-security.htmlnode

 

用到的技術:

1. nodejs搭建本地http服務器git

2. 應用node-http-proxy,作接口url的轉發github

 

具體方法:

1. node.js搭建本地http服務器參考了shawn.xie的《nodejs搭建本地http服務器》web

2. node.js作轉發使用node-http-proxy實現,官方文檔:https://github.com/nodejitsu/node-http-proxy#using-httpschrome

3. 操做方法參考了:http://hao.jser.com/archive/10394/?utm_source=tuicool&utm_medium=referral

4. 下面是我本身的實戰操做

項目準備

1. npm初始化

npm init

2. 安裝node-http-proxy模塊

npm install http-proxy --save-dev

3. 項目結構

 下面的例子中,咱們把html文件直接放在根目錄'./',也能夠指定一個網站目錄,在proxy.js中能夠自定義

 

配置HTTP服務器和PROXY轉發

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
    // 下面的設置用於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); // 指定根目錄
    var realPath = path.join("./", pathname);
    console.log(pathname);
    console.log(realPath);
    var ext = path.extname(realPath);
    ext = ext ? ext.slice(1) : 'unknown';

    //判斷若是是接口訪問,則經過proxy轉發
    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

這裏參考shawn.xie的源碼,補充了幾個字體文件的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"
};

以上就是所有源碼

而後把項目中的接口地址改爲http://localhost:3000/......

 

啓動nodejs服務

啓動cmd,定位到項目目錄,運行

node proxy.js

訪問:

http://localhost:3000/index.html

能夠看到項目中調用的http://localhost:3000/.....  都會從http://192.168.10.38:8180/...... 獲取數據,而後轉發到本地。

這樣就不存在跨域了。

相關文章
相關標籤/搜索