Netty: Closing WebSockets correctly

Question

How can I close a WebSocket channel/connection from server side correctly? If I use a ctx.getChannel().close(), the onerror in the Brwoser (Firefox 9) is thrown:

The connection to ws://localhost:8080/websocket was interrupted while the page was loading

I also tried to send a CloseWebSocketFrame within the channelClosed-method in the WebSocketServerHandler:

public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e)
        throws Exception {
    CloseWebSocketFrame close = new CloseWebSocketFrame();
    ctx.getChannel().write(close);
}

This throws an ClosedChannelException (maybe related to this?).

Answer 1

You have to do this:

ch.write(new CloseWebSocketFrame());

then the server will close the connection. If the connection is not closed soon enough, you can call ch.close().

Answer 2

How about

ctx.getChannel().write(new CloseWebSocketFrame()).addListener(ChannelFutureListener.CLOSE);

That should send the CloseWebSocketFrame and then close the channel after that.