Hands-On Reactive Programming in Spring 5

Client-side WebSocket API

Unlike the WebSocket module (which is based on WebMVC), WebFlux provides us with client-side support too. In order to send a WebSocket connection request, we have the WebSocketClient class. WebSocketClient has two central methods to execute WebSocket connections, as shown in the following code sample:

public interface WebSocketClient {   Mono<Void> execute(      URI url,      WebSocketHandler handler   );   Mono<Void> execute(      URI url,      HttpHeaders headers,       WebSocketHandler handler   );}

As we can see, WebSocketClient uses the same WebSockeHandler interface in order to process messages from the server and send messages back. There are a few WebSocketClient implementations that are related to the server engine, such as the TomcatWebSocketClient ...