node/test/simple/test-http-upgrade-client.js

// Verify that the 'upgrade' header causes an 'upgrade' event to be emitted to
// the HTTP client. This test uses a raw TCP server to better control server
// behavior.

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

var http = require('http');
var net = require('net');

// Create a TCP server
var srv = net.createServer(function(c) {
    var data = '';
    c.addListener('data', function(d) {
        data += d.toString('utf8');

        c.write('HTTP/1.1 101\r\n');
        c.write('hello: world\r\n');
        c.write('connection: upgrade\r\n');
        c.write('upgrade: websocket\r\n');
        c.write('\r\n');
        c.write('nurtzo');
    });

    c.addListener('end', function() {
        c.end();
    });
});

var gotUpgrade = false;

srv.listen(common.PORT, '127.0.0.1', function () {

  var hc = http.createClient(common.PORT, '127.0.0.1');
  hc.addListener('upgrade', function(res, socket, upgradeHead) {
      // XXX: This test isn't fantastic, as it assumes that the entire response
      //      from the server will arrive in a single data callback
      assert.equal(upgradeHead, 'nurtzo');

      console.log(res.headers);
      var expectedHeaders = { "hello": "world",
                              "connection": "upgrade",
                              "upgrade": "websocket" };
      assert.deepEqual(expectedHeaders, res.headers);

      socket.end();
      srv.close();

      gotUpgrade = true;
  });
  hc.request('GET', '/').end();
});

process.addListener('exit', function() {
    assert.ok(gotUpgrade);
});