node/test/simple/test-http-keep-alive.js

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var common = require('../common');
var assert = require('assert');
var http = require('http');
var util = require('util');

var body = 'hello world\n';
var headers = {'connection': 'keep-alive'};

var server = http.createServer(function(req, res) {
  res.writeHead(200, {'Content-Length': body.length});
  res.write(body);
  res.end();
});

var connectCount = 0;

server.listen(common.PORT, function() {
  var agent = new http.Agent({maxSockets: 1});
  var request = http.request({method: 'GET', path: '/', headers: headers, port: common.PORT, agent: agent}, function() {
    assert.equal(1, agent.sockets['localhost:' + common.PORT].length);
  });
  request.end();

  request = http.request({method: 'GET', path: '/', headers: headers, port: common.PORT, agent: agent}, function() {
    assert.equal(1, agent.sockets['localhost:' + common.PORT].length);
  });
  request.end();
  request = http.request({method: 'GET', path: '/', headers: headers, port: common.PORT, agent: agent}, function(response) {
    response.on('end', function() {
      assert.equal(1, agent.sockets['localhost:' + common.PORT].length);
      server.close();
    });
  });
  request.end();
});