anchor.diff:      _HttpDetachedIncoming detachedIncoming = _httpParser.detachIncoming();
   
       return _streamFuture.then((_) {
  -      _connections.remove(_serviceId);
         return new _DetachedSocket(_socket, detachedIncoming);
       });
     }
  
positive.code: 
    _HttpConnection(this._socket, this._httpServer)
        : _httpParser = new _HttpParser.requestParser() {
      _connections[_serviceId] = this;
      _httpParser.listenToStream(_socket);
      _subscription = _httpParser.listen((incoming) {
        _httpServer._markActive(this);
  
negative.code:         _sessionManagerInstance != null) {
        _sessionManagerInstance.close();
        _sessionManagerInstance = null;
      }
    }
  
  