Invalid handshake response getStatus: 404 Not Found for a websocket connection

Cloud Version : Greenwich.RELEASE Spring Boot Version: 2.1.6.RELEASE

I am trying to connect to a simple websocket and to route the connection through the gateway. Configuration is the following

  routes:
      - id: websocket
        uri: ws://localhost:10000
        predicates:
        - Path=/ws/**

I then use a simple java client to try connecting through the gateway with the socket and I get the following error:

io.netty.handler.codec.http.websocketx.WebSocketHandshakeException: Invalid handshake response getStatus: 404 
	at io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker13.verify(WebSocketClientHandshaker13.java:226) ~[netty-codec-http-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker.finishHandshake(WebSocketClientHandshaker.java:276) ~[netty-codec-http-4.1.36.Final.jar:4.1.36.Final]
	at reactor.netty.http.client.WebsocketClientOperations.onInboundNext(WebsocketClientOperations.java:113) ~[reactor-netty-0.8.9.RELEASE.jar:0.8.9.RELEASE]
	at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:91) ~[reactor-netty-0.8.9.RELEASE.jar:0.8.9.RELEASE]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) ~[netty-transport-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) ~[netty-transport-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) ~[netty-transport-4.1.36.Final.jar:4.1.36.Final]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) ~[netty-codec-4.1.36.Final.jar:4.1.36.Final]

I have not idea what I am doing wrong.

demo-micro.zip