nodejs反向代理

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正向代理代理客户端，反向代理代理服务器。
使用nodejs实现简单的反向代理需要
1、创建一个http服务
2、服务接收到客户端请求后，去请求目的url
3、获取请求结果，返回给客户端

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var http = require('http');
var https = require('https');
var path = require('path');
console.log('run')
// Create HTTP Server
http.createServer(function(req, res) {
    var uri = 'https://github.com/' + req.url;
    var file = req.url.replace(/\?.*/ig, '');
    var ext = path.extname(file);
    var type = getContentType(ext);
    res.writeHead(200, {
        'Content-Type': type
    });
    https.get(uri, function(response) {
        response.addListener('data', function(chunk)
        {
            res.write(chunk, 'binary');
        });
        response.addListener('end', function()
        {
            res.end();
        });
    });
}).listen(3000);
// Get content-type
var getContentType = function(ext) {
    var contentType = '';
    switch (ext) {
        case "":
            contentType = "text/html";
            break;
        case ".html":
            contentType = "text/html";
            break;
        case ".js":
            contentType = "text/javascriptss";
            break;
        case ".css":
            contentType = "text/css";
            break;
        case ".gif":
            contentType = "image/gif";
            break;
        case ".jpg":
            contentType = "image/jpeg";
            break;
        case ".png":
            contentType = "image/png";
            break;
        case ".ico":
            contentType = "image/icon";
            break;
        default:
            contentType = "application/octet-stream";
    }
    return contentType;
};