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。

  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

  1. 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》

  1. 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

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

  3. 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

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。

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转载自blog.csdn.net/qq_36620428/article/details/79942190
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