Spring Boot 2 WebSockets connection lost unexpectedly - spring-boot

Question

I have a Spring boot 1.5 + Angular5 application utilizing Websockets via SockJS, and was recently forced to upgrade to Spring boot 2.2.
Following the upgrade, my websocket is being closed after either a random period of time, or when a write to the websocket happens. When using Spring Boot 1.5, everything works perfectly.
Below is the configuration in Spring, using spring-boot-starter-websocket version: '2.2.4.RELEASE'
#Configuration
#EnableWebSocketMessageBroker
public class WebSocketConfiguration extends AbstractWebSocketMessageBrokerConfigurer {
#Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/api/socket")
.setAllowedOrigins("*")
.withSockJS();
}
#Override
public void configureMessageBroker(MessageBrokerRegistry registry) {
registry.setApplicationDestinationPrefixes("/app")
.enableSimpleBroker("/nightly");
}
}
I've also added the following security rules:
#Override
protected void configure(HttpSecurity http) throws Exception {
http
.antMatcher("/api/socket/**")
.cors().and()
.headers().frameOptions().disable().and()
.csrf().disable()
.authorizeRequests()
.anyRequest().permitAll();
}
Client code:
initWebSocket() {
const ws = new SockJS('/api/socket');
this.stompClient = Stomp.over(ws);
const that = this;
this.stompClient.connect({}, () => {
that.stompClient.subscribe('/nightly', (message) => {
this._rootStore.dispatch(new UpdateNightlyAction(message));
});
});
}
When the connection is lost, the client logs the following:
POST https://<url>/api/socket/231/i0rsgjlx/xhr?t=1600673163228 404
Whoops! Lost connection to https://<url>/api/socket
I went through different scenarios of Websockets not working in Spring Boot 2 and nothing seemed to help. In 1.5 it works just fine. What am I missing here?

Answer 1

beacuse of springboot2.0^ is not allow cors param allowedOrigins = "*" , you can overwrite AllowedOriginPatterns equals "*"
boot1.5 ->
#Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
StompWebSocketEndpointRegistration registration = registry.addEndpoint("/webSocket");
registration.setAllowedOrigins("*");
registration.withSockJS();
}
boot2.0^->
#Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
StompWebSocketEndpointRegistration registration = registry.addEndpoint("/webSocket");
// boot2.0^ AllowedOrigins = * is not allown
registration.setAllowedOriginPatterns("*");
registration.withSockJS();
}
I had a same error with yours, even search for a long time ,but there is no
answers,so i check the debug log find this problem,i fixed it with this method,it works!