anchor.diff:    }
   
     bool _close() {
  +    _closing = true;
       _socket.close();
     }
   
  
positive.code: 
      // If currently not processing any request just close the socket.
      if (_httpParser.isIdle) {
        _socket.close();
        if (onClosed != null && e == null) {
          // Don't call onClosed if onError has been called.
          onClosed();
  
negative.code:     }
      _server = null;
      for (_HttpConnection connection in _connections) {
        connection._close();
      }
      _connections.clear();
    }
  