In these changes, I added a "KA" instance to GraphQlWebSocketMessageType to support this type. Likewise, on the WebSocket client side, in the WebSocketGraphQlTransport class and the handle method, if the type "KA" is received from the server side, the IllegalStateException error will not be thrown, and there is no need for any reaction from the client side. Like receiving a pong message.
In these changes, I added a "KA" instance to GraphQlWebSocketMessageType to support this type. Likewise, on the WebSocket client side, in the WebSocketGraphQlTransport class and the handle method, if the type "KA" is received from the server side, the IllegalStateException error will not be thrown, and there is no need for any reaction from the client side. Like receiving a pong message.