用来做手机流量限制，以模拟慢速的2G网络。

http_proxy.js

var fs = require('fs');
var http = require('http');
var util = require('util');
var url = require('url');

http.createServer(function (req, res) {
  var options = url.parse(req.url);
	var req_headers = req.headers;
	req_headers["connection"] = "close";
	var req_options = {
		hostname: options.hostname,
		port: options.port || 80,
		path: options.path || "/",
		method: req.method || "GET",
		headers: req_headers
	}
	console.log(req_options);
	var remote_req = http.request(req_options, function (remote_res) {
		console.log(remote_res.headers);
		res.writeHead(remote_res.statusCode, remote_res.headers);
		remote_res.on('data', function (data) {
			console.log(''+data.length);
			res.write(data);
			remote_res.pause();
			setTimeout(function () {
				remote_res.resume();
			},1000);
		})
		remote_res.on('end', function () {
			res.end();
		})
		//remote_res.pipe(res);
	});
	remote_req.on('error', function (e) {
		console.log("problem with request " + e.message);
	});
	req.pipe(remote_req);
	//res.end(util.inspect(req));
}).listen(8080);