nodej读取客户端ip

代码比较简单了

#!/usr/bin/env nodejs

var http = require('http');
var fs = require("fs");

http.createServer(function (req, res) {
    var ip = req.headers['x-forwarded-for'] ||
        req.connection.remoteAddress ||
        req.socket.remoteAddress ||
        req.connection.socket.remoteAddress;
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end(ip);

    fs.writeFile('ip', ip + "\n", function (err) {
        if (err) throw err;
//        console.log('It\'s saved!');
    });

}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337/');