node/test/parallel/test-http-localaddress.js

'use strict';
var common = require('../common');
var http = require('http'),
    assert = require('assert');

if (!common.hasMultiLocalhost()) {
  console.log('1..0 # Skipped: platform-specific test.');
  return;
}

var server = http.createServer(function(req, res) {
  console.log('Connect from: ' + req.connection.remoteAddress);
  assert.equal('127.0.0.2', req.connection.remoteAddress);

  req.on('end', function() {
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.end('You are from: ' + req.connection.remoteAddress);
  });
  req.resume();
});

server.listen(common.PORT, '127.0.0.1', function() {
  var options = { host: 'localhost',
    port: common.PORT,
    path: '/',
    method: 'GET',
    localAddress: '127.0.0.2' };

  var req = http.request(options, function(res) {
    res.on('end', function() {
      server.close();
      process.exit();
    });
    res.resume();
  });
  req.end();
});