code: function addShutdown(server) {
    var connections = {};
    var isShuttingDown = false;
    var connectionCounter = 0;
  
    function destroy(socket, force) {
      if (force || (socket._isIdle && isShuttingDown)) {
        socket.destroy();
        delete connections[socket._connectionId];
      }
    };
  
    function onConnection(socket) {
      var id = connectionCounter++;
      socket._isIdle = true;
      socket._connectionId = id;
      connections[id] = socket;
  
      socket.on('close', function() {
        delete connections[id];
      });
    };
  
    server.on('request', function(req, res) {
      req.socket._isIdle = false;
  
      res.on('finish', function() {
        req.socket._isIdle = true;
        destroy(req.socket);
      });
    });
  
    server.on('connection', onConnection);
    server.on('secureConnection', onConnection);
  
    function shutdown(force, cb) {
      isShuttingDown = true;
      server.close(function(err) {
        if (cb) {
          process.nextTick(function() { cb(err); });
        }
      });
  
      Object.keys(connections).forEach(function(key) {
        destroy(connections[key], force);
      });
    };
  
    server.shutdown = function(cb) {
      shutdown(false, cb);
    };
  
    server.forceShutdown = function(cb) {
      shutdown(true, cb);
    };
  
    return server;
  }
docs: Adds shutdown functionaility to the `http.Server` object
  @param {http.Server} server The server to add shutdown functionaility to