Add workaround for Undertow WebSocket client sending illegal Origin

Undertow’s WebSocket client sends an illegal Origin header – it does
not include the scheme, e.g. it’ll send “localhost” rather than
“http://localhost”. This commit works around the problem by allowing
access to the SockJS endpoints from any origin, thereby disabling
OriginHandlerInterceptor’s checking of the Origin header.

spring-boot-samples/spring-boot-sample-websocket-undertow/src/main/java/samples/websocket/SampleUndertowWebSocketsApplication.java

@@ -45,8 +45,10 @@ public class SampleUndertowWebSocketsApplication extends SpringBootServletInitia
 
 	@Override
 	public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
-		registry.addHandler(echoWebSocketHandler(), "/echo").withSockJS();
-		registry.addHandler(snakeWebSocketHandler(), "/snake").withSockJS();
+		registry.addHandler(echoWebSocketHandler(), "/echo").setAllowedOrigins("*")
+				.withSockJS();
+		registry.addHandler(snakeWebSocketHandler(), "/snake").setAllowedOrigins("*")
+				.withSockJS();
 	}
 
 	@Override