when disconnecting from websocket server, CloseWebSocketFrame does not reach client

[myninjagos]

Hi,

i am using google's smart websocket client to test my websocket server.
after connecting and pressing the button 'disconnect', i would expect that this button should turn into 'connect'. instead, it still shows 'disconnect'.
from logs, it seems that CloseWebSocketFrame bytes are never reach the client.

my configuration

	@Bean
	public HandlerMapping webSocketMapping() {
		Map<String, WebSocketHandler> map = new HashMap<>();
		map.put("/wsticker", (session) -> 
			session.send(
				session.receive()
					.map(WebSocketMessage::retain)));

		SimpleUrlHandlerMapping mapping = new SimpleUrlHandlerMapping();
		mapping.setUrlMap(map);
		mapping.setOrder(10);
		
		return mapping;
	}

	@Bean
	public WebSocketHandlerAdapter handlerAdapter() {
		return new WebSocketHandlerAdapter();
	}

logs

2018-04-23 17:43:53.001 [reactor-http-nio-2] DEBUG reactor.ipc.netty.http.server.HttpServer -  - [id: 0x06164d82, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:57285] READ: 6B
         +-------------------------------------------------+
         |  0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f |
+--------+-------------------------------------------------+----------------+
|00000000| 88 80 44 71 b7 55                               |..Dq.U          |
+--------+-------------------------------------------------+----------------+
2018-04-23 17:43:53.002 [reactor-http-nio-2] DEBUG io.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder -  - Decoding WebSocket Frame opCode=8
2018-04-23 17:43:53.002 [reactor-http-nio-2] DEBUG io.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder -  - Decoding WebSocket Frame length=0
2018-04-23 17:43:53.003 [reactor-http-nio-2] DEBUG reactor.ipc.netty.http.server.HttpServerOperations -  - CloseWebSocketFrame detected. Closing Websocket
2018-04-23 17:43:55.745 [reactor-http-nio-2] DEBUG reactor.ipc.netty.channel.ChannelOperationsHandler -  - [id: 0x06164d82, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:57285] Writing object CloseWebSocketFrame(data: PooledUnsafeDirectByteBuf(ridx: 0, widx: 0, cap: 0))
2018-04-23 17:43:55.745 [reactor-http-nio-2] DEBUG reactor.ipc.netty.http.server.HttpServer -  - [id: 0x06164d82, L:/0:0:0:0:0:0:0:1:8080 - R:/0:0:0:0:0:0:0:1:57285] READ COMPLETE

thanks
B.