Enabling Cross Origin Requests for WebSockets in Spring

Question

I have a OpenShift Wildfly server. I am building a website with the Spring MVC framework. One of my webpages also uses a WebSocket connection. On the server side, I

Answer 1

I don't think it's a CORS issue because it's connected successully before being disconnected. If that's CORS, you can't even connect.

I think it's a communication problem between your DNS & openshift because WebSocket need a persistent connection (long-live) which keeps opening between client & server. If your DNS (e.g. CloudFlare or something like that) does not support / not configured to use WebSocket, the client would be disconnected immediately as in your issue.

Answer 2

Have you tried implementing the WebMvcConfigurer and overriding the method addCorsMappings()? If not try this and see.

@EnableWebMvc
@Configuration
@ComponentScan
public class WebConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {

        registry.addMapping("/**")
        .allowedOrigins("*")
        .allowedMethods("GET", "POST")
        .allowedHeaders("Origin", "Accept", "Content-Type", "Authorization")
        .allowCredentials(true)
        .maxAge(3600);

    }

}